An example of some of the script I have already: % Opening the file to be editted. will indeed output to the Command Window (and separate figure windows. But the second graph replaces the 1st graph when that command is executed. I have a script which requires the user to enter inputs via the input ('some question :', 's') prompt. Sign in to comment. MATLAB Language Fundamentals Data Types Data Type Identification Whos. Each field of s is itself a structure that summarizes the values in the corresponding variable of T. Learn more about printing nicely, latex, anonymous functions, plot, plotting, function. Find more on Graphics Object Programming in Help. S = str2sym (S) S = 1. For example: \_w will make _w appear in your text. x = 1. The input data are double-precision floating-point values rather than unsigned integers. * operator. Accepted Answer. I know I can report errors or warnings, and they display in red or whatever. Tags color to output text; Community Treasure Hunt. The format string fstr should contain a format descriptor for each variable in variable_list. c = 1×6 2023 8 19 12 30 46. There is no way to direct output to the Command Window from a live script that you run in the Live Editor. nice to meet you. fig = figure; plot (1:10) print (fig, 'MySavedPlot', '-dpng') Alternatively, refer to a figure using the value of its Number property, which is the integer value that displays in the figure window title bar. You can run the live script from the command line; e. Formatted output. Here is a more generalized solution that prints all elements of x the vector x in this format: x=randperm (3); s = repmat ('%d,',1,length (x)); s (end)= []; %Remove trailing comma disp (sprintf ( ['Answer: (' s ')'], x)) Share. In this case, add text to the point ( π, sin ( π)). The Live Editor has a different way of controlling how pages look when printing. number = 42; % Define a structure. MATLAB allows you to use your data in another application that reads ASCII files. Hello, I am using MATLAB R2018b and want to print greek letters like 'µ' to a text/ini file from matlab using fprintf. Tags array; fprintf array; matrix; matrix array; fprintf matrix; Community Treasure Hunt. Below is the nested for loop for the 5th figure: Theme. Tables consist of rows and column-oriented variables. You need to printf each member of the structure or the contents of each cell according to what data type that member or cell is. I am trying to print code to look like the following, inserting variables in between text. Call the nexttile function to create an axes object and return the object as ax1. 000000 5. ) ; where fig is the file identifier returned by FOPEN (or 1. in the "Find What" filed enter this string: [^;]$. Find more on Whos in Help Center and File Exchange. 4 × 10 using either double or single precision. Use the disp function to print the messages to the command window, e. I am trying to print out the code I wrote to the "command window". How do i print a vector in matlab with also something before the values. Help to print cell array in command window. So I can do something like: >> d = datetime ('12:10:00') - datetime ('12:05:00') d = 00:05:00 >> whos d Name Size Bytes Class Attributes d 1x1 128 duration. 1 Answer. 5867 1. fprintf ( fid, '%f %f %f %f %f %f\n', m. fig = figure; plot (1:10) print (fig, 'MySavedPlot', '-dpng') Alternatively, refer to a figure using the value of its Number property, which is the integer value that displays in the figure window title bar. printf ('At %d', i); end. Otherwise, the writing function creates a comma separated text file and appends the extension. Roger Stafford on 16 Feb 2015. See the format reference page for a list and description of all supported numeric formats. Sign in to comment. In cell arrays, each string is treated as a separate. It would be nice to print if out this way: Theme. " +. " It sounds to me like they want to list the variables present after an exception occurs. path (newfolder,oldpath) adds the folder newfolder to the beginning of the search path. Understanding the syntax and parameters of Matlab's Print Function is crucial for effective. You need to printf each member of the structure or the contents of each cell according to what data type that member or cell is. T = true (n) is an n -by- n matrix of logical ones. Specify the orientation as either portrait, landscape , or tall. Is it possible in matlab?. When you create a datetime array, it uses the MATLAB ® global default datetime display format unless you explicitly provide a format. How to print a Greek symbol on a figure using the function sprintf in MATLAB? I want to write an equation: ε = C x² on a MATLAB figure (not x and y label). csv','w'); a= 3; lamda = 1. 8000 39. To display some text and a matrix, you can use two disp statements. Use double apostrophe just as you would in any matlab string: Theme. S = str2sym (S) S = 1. Each element of a string array stores a sequence of characters. tic/toc and timeit. warning ). Based on your location, we recommend that you select:. MATLAB interprets the TeX markup as long as the Interpreter property of the text object is set to 'tex' (the default). How to print the string value using fprintf. For example. The two answers on here are correct - however if you take the for loop from one and the sprintf from the other you get a faster result:. fprintf ('Avogadro''s constant is 6. To accommodate future changes in the MATLAB error-handling capabilities, there is a new restriction to the syntax of the try-catch block. orient (fig,ornt) sets the paper orientation for the. s = struct (field,value) creates a structure array with the specified field and value. Looking at this link (Unicode Table for Greek Chars), the Unicode for Greek capital Delta (Δ) is U+0394 or 0x0394 hex. \^t will make ^t appear in your text. There is no way to direct output to the Command Window from a live script that you run in the Live Editor. print (filename,formattype) saves the current figure to a file using the specified file format, such as print ('BarPlot','-dpng'). Otherwise it will be to the file you want to write to. The fprintf function reads the input variables in a column first manner and sends each value to its appropriate place in the string. Sending the output to internet explorer might function as a work around but re-saving the file with html headers and relying on another program to print it then. Theme Copy percentError = 0. I have a Matlab function which runs into few thousands of lines of code. Choose a web site to get translated content where available and see local events and offers. It has a few important restrictions. , if your file is myScript. Learn more about text file, fprintf MATLAB. You can run the live script from the command line; e. Sep 10, 2015 · Accepted Answer. I'd like a general tag for fprintf to select colorized text output. The interpretation everyone else has made doesn't. mlx, then. For additional details about the performance of your code, such as function call information and execution time of individual lines of code, use the MATLAB ® Profiler. Learn how to use disp function to display the value of a variable without printing its name in the Command Window. Learn more about sprintf, matrix, display MATLAB. Perform multiplication of 'len' and 'wid' and store the result in the variables 'area'. It makes the printout very readable by putting the numerator and denominator in the correct order. The critical windows for the exercise are the. Dec 28, 2013 · The latter shows a temporary variable to shorten the building a little if need more than just one. The fprintf function does not add a line feed unless you explicitly tell it to. It's simple and effective with size(x) but no name or location. See syntax, options, and examples for various options and formats. 6000 22. This function allows you to print a detailed summary of the progress of a parfor loop (or any loop for that matter) which contains the start time, length of time running, estimated finish time and percentage completion. r = 1:2; a = [7 13]; fprintf ('row %d, a = %d ', r, a); It would be natural to expect that the first element of r would be paired with the first element of a giving "row 1, a = 7" as the first output. Learn more about arrays, array, vector, fprintf MATLAB. ,xM) declares a function named myfun that accepts inputs x1,. Connect and share knowledge within a single location that is structured and easy to search. x and later rely upon a figure's "PaperPosition" to specify the size of the output file. Learn how to display text in the Command Window using disp or fprintf functions. There is no way to direct output to the Command Window from a live script that you run in the Live Editor. madhan ravi It's perfect, but is there a way to put them all in a row vector and without quotes. Of course there is no correct answer because these are binary floating point values, but here is one solution that gives the "least unexpected" output. Live scripts and live functions are program files useful for interacting with a series of MATLAB ® commands. To control some additional aspects of printing a block diagram, use the set_param command with model parameters. I can find the maximum number of digits across array's data:. The printer must be set up on your system. You can run the live script from the command line; e. Request a numeric input, and then multiply the input by 10. The fprintf function optionally requires a 'fileID' variable as its first argument, with 1 indicating 'stdout', that being the Command Window. fprintf ('ca {1} = %s\nca {2} = %d\n', ca {1}, ca {2}); s. formatspec = 'name: %s\nnumber: %d\ntype: %s\n'; for ii= 1:10 out=fprintf (formatspec. This is often useful for debugging purposes. To clarify, the 2 in %. txt file of r, theta and V as I am unable to see a formatSpec to include complex numbers. For example, create a bar chart to print. Pretty Print Long Expressions Solve this equation, and then use pretty to represent the solutions in the format similar to typeset mathematics. You are indexing the elements of the struct array with { and } which are only used for cell arrays. You can print a block diagram: Interactively, in the Simulink ® Editor. This works, but open your file in Notepad++ or other application, default windows application does not represent the correct format, sometime shows new line as a space. Find more on Annotations in Help Center and File Exchange. Each column of each variable in A becomes a column in the output file. \n', numerical_value_1, units, numerical_value_two,. The field width operator can be a number, or an asterisk (*) to refer to an input argument. CPRINTF then displays the text in the Command Window using the specified STYLE argument. But the most important part is the fact that you must use the handle on the fprintf function to update the previous. Use dot. Find out how to format numeric and character values, display tabular data, get number of bytes written and more. \^t will make ^t appear in your text. To display text in the Command Window, use disp or fprintf. Learn more about Teams. The Live Editor has a different way of controlling how pages look when printing. print ('The minimum value is', minY1 (2), 'which occurs at x = ',. You can use the very simple. sz is a two-element numeric array, where sz (1) specifies the number of rows and sz (2) specifies the number of variables. If T is a timetable, then s also has a field that summarizes the row times of T. I think you know what I want to do; please help! 0 Comments. m files. There is no way to direct output to the Command Window from a live script that you run in the Live Editor. To remedy this, I wrote a little routine called "binstr" that expresses any double as an exact binary string, and which if it is of interest, can be. f you use it if you want the number to be indented by 4 whitespaces and take just the integer part. m file" into pdf format. The fprintf function is used for printing information to the screen. This is apparently not what you intended to do. fprintf ('%d. For instance, s = struct ('a', [1 2 3]) creates a 1-by-1. We can use the fprintf() or disp() methods. If I can't print the full directory into the log file, the last directory name, in this case 'Project_1' is also a good solution for me. If your integer values are small enough to fit within double then you can use. By combining the ability of 3D printing to make. To change the. You can run the live script from the command line; e. printf ('At %d', i); end. For example, MATLAB uses 3 digits to display int8 data types (for instance, -128:127). Program files that can include formatted text, images, and output to explain the code. ) ; where fig is the file identifier returned by FOPEN (or 1 if you want to test on stdout/screen). Youj can do it using sprintf : string2Print=sprintf ('%s ','Hi','nice to meet you'); disp (string2Print) This prints: Hi. To accommodate future changes in the MATLAB error-handling capabilities, there is a new restriction to the syntax of the try-catch block. Prevent printing to command line in MATLAB. xx cm. Find more on Whos in Help Center and File Exchange. Print Model Diagrams. x = 1. To "place" a number into this string of printed characters we use. This function allows you to print a detailed summary of the progress of a parfor loop (or any loop for that matter) which contains the start time, length of time running, estimated finish time and percentage completion. But I'm trying to sort variables from highest to lowest and I want to get Matlab to print their corresponding variables rather than just giving me numbers. Using the format function only sets the format for the current MATLAB session. With the statement the above is in a loop and it only does one, one can then add to the guess that the above may be arrays and you forgot to index into them, in which case MATLAB will try to send each array to the format string for output. You can exchange data between MATLAB and Excel, taking advantage of the familiar Excel interface while gaining access to MATLAB algorithms in image processing, data analytics, and. 3224 converged=true (or sometimes false) which results in, x is 1. 4f and the second value of coord(:, 1) in the. Tags color to output text; Community Treasure Hunt. pdf in the current directory. 2) Don't close the 'Export Setup' window. Learn more about #matrix i wrote this code to print the largest element in the first row of a matrix, but it print the index of the largest number?. i is equivalent to sqrt (-1). A fresh command page is open below. Your last method is working because datestr returns a string see documentation. Otherwise, the line is cut off at page boundaries. fi\n', real (V1), imag (V1)") note that disp ends with a new line while fprintf doesn't that's why we use ' \n '. Learn more about fprintf. The first two input arguments to the text function specify the position. This technique is useful if you temporarily turn off some warnings and later reinstate the original settings. fig = figure; plot (1:10) print (fig, 'MySavedPlot', '-dpng') Alternatively, refer to a figure using the value of its Number property, which is the integer value that displays in the figure window title bar. You are indexing the elements of the struct array with { and } which are only used for cell arrays. The right side of the dialog box shows an approximation of the changes you make on the left side. The array size need to monitor. Simple ( and ) will work just fine. Name: Left angle bracket and ampersand. for x = B (44:47,5) %B is the excel. MATLAB Code — A MATLAB script, function, or class. There are a few ways to print the contents of an array in MATLAB. The function recycles the format string through the elements of A (columnwise) until all the elements are used up. Each element of C specifies the color for 1 pixel of the image. Is there a way to print code from the app designer? I haven't found any way from the AppDesigner development environment itself. Below is the nested for loop for the 5th figure: Theme. 000 55. A good way to visualize this concept is with a matrix. fi\n', real (V1), imag (V1)") note that disp ends with a new line while fprintf doesn't that's why we use ' \n '. The function. You need to printf each member of the structure or the contents of each cell according to what data type that member or cell is. Sometimes can be easier than trying to work thru the eyestrain sure to result from the double-up exercise; I had more trouble trying to decipher the string you were trying to build than I cared to try to fight thru; hence the example instead. The settings are presented on four tabs with the following functions:. Your second method is also not working because again Dtimes is an array and you cannot use %s to print it. Roger Stafford on 16 Feb 2015. T = true (sz) is an array of logical ones where the size vector, sz , defines size (T). Sorted by: 4. \x03bb is using the documented fprintf() / sprintf() facility to encode character positions in the current font (which is not necessarily Unicode). Aug 12, 2020 · How to print out 2 variables using disp () function. The field width operator can be a number, or an asterisk (*) to refer to an input argument. Based on your location, we recommend that you select:. Find more on Annotations in Help Center and File Exchange. " It sounds to me like they want to list the variables present after an exception occurs. I want to print its element using a single fprintf command. for i=1:100. Starting in R2019b, you can display a tiling of plots using the tiledlayout and nexttile functions. xlsx' ; writetable (T,filename, 'Sheet' ,1, 'Range', 'D1') Write the table T without the variable names to a new sheet. com ')% prints the desired statement. mlx, then. F = symsum(f,k,a,b) returns the symbolic definite sum of the series f with respect to the summation index k from the lower bound a to the upper bound b. This investigation has uncovered evidence of one or. patients2 = 0x0 empty table. 8000 5. The Print Function in Matlab is used to generate hard copies of your figures, or to. You can delete commands from the command history using right click->delete. fprintf ('Avogadro''s constant is 6. Learn more about arrays, array, vector, fprintf MATLAB. Remember that binary numbers need not have an exact decimal format with a limited number of digits, and the other way around. The use of the command fprintf is shown below. A fresh command page is open below. To change the page setup options when exporting in the Live Editor, use settings. Learn more about fprintf. Learn more about matrix, matrix array, for loop. Sign In to Your MathWorks Account;. Find the treasures in MATLAB Central and discover how the community can help you! Start Hunting!. fprintf ('Avogadro''s constant is 6. 000000 14. The fprintf function prints an array of characters to the screen: fprintf ('Happy Birthday '); We often use the fprintf statement to show the user information stored in our variables. There is no way to direct output to the Command Window from a live script that you run in the Live Editor. Hi I am trying to print a table (by just using fprintf or disp); please comment below if you know how to make each line align with its corresponding header as possible. To clarify, the 2 in %. summary (A) prints a summary of the categorical array A. Then you can use fprintf with three different %s formats to print out name, name(1), and name(end). The trick to sprintf () and fprintf () is that each value in memory advances to the next format element. Matlab: Printing literally using fprintf. CPRINTF then displays the text in the Command Window using the specified STYLE argument. \^t will make ^t appear in your text. To print the figure programmatically, use the print function. This article has been retracted by Hindawi following an investigation undertaken by the publisher [ 1 ]. The function returns a truecolor image. Accepted Answer. Just like if i just use the matrix name BS_chan. Create a matrix A. " +. Find out how to customize, copy, or save the figure, and how to. x = 1. For example, create a bar chart to print. Use the format function, for example: format short format short e format long. end fprintf (' done. These values are returned in a list with each value separated by a comma. There is no way to direct output to the Command Window from a live script that you run in the Live Editor. I recommend using fprintf (1,"%d",i); - it makes it explicit that you are printing to "file id 1" (the console); it also makes. To display text in the Command Window, use disp or fprintf. Accepted Answer. 8000 5. In MATLAB, functions are defined in separate files. However in Live Script, you get a nice display if you use. If not, use fprintf as suggested or disp (s) where s is a string containing what you need. next bus near me, charlotte sartreporn
3 0. . How to print in matlab
Learn how to use disp function to display the value of a variable without printing its name in the Command Window. Learn how to print your MATLAB work using the GUI or the printopt () and print () functions. -painters: this specifies the use of the painters alogrithm for the exporting. varTypes specifies the data types of the variables. Live scripts and live functions are program files useful for interacting with a series of MATLAB ® commands. Command Window — Right-click in the Command Window and select Page Setup. Your second method is also not working because again Dtimes is an array and you cannot use %s to print it. print_m_file ('myMfile. Based on your location, we recommend that you select:. Hi all, I am geting a directory name using: Dir_Name = uigetdir; Into Dir_Name, which is of type 'char', I get something like D:\Data\My_Projects\Project_1. Learning to Print a Matrix in MATLAB - A Comprehensive Guide This article aims to provide a thorough understanding of how to print a matrix in MATLAB. Normally, the statements in a script are not displayed during execution. i would like to print this data set in the exact same format, same data on each column and row but matlab prints the rows into columns, im not sure how to print it correctly. \\theta will make \theta appear in your text. 8f %', percentError); It is currently. Ran in: If you're not sure where to break the line of text, you can use the textwrap function. ca = {'abc', 24}; % Define a cell array. Yf, A). 4 × 10 using either double or single precision. But is this python kind of printing possible in matlab with any way. how to display newline. The "formatting numbers" article at the "Undocumented Matlab" blog explains how to do this: >> nf = java. fprintf([repmat('%f\t', 1, size(A, 2)) '\n'], A'); You will have one superfluous tab \t at the end of each line, though: >> A = magic(5) A = 17 24 1 8 15 23 5 7 14 16 4 6 13 20 22 10 12 19 21 3 11 18 25 2 9 >> fprintf([repmat('%f\t', 1, size(A, 2)) '\n'], A') 17. mlx, then. disp does not seem to want to work, nor does fprintf. Hello world!\n', sentence); % print the index, and a newline \n. Set the output format so that floating-point values display with up to five digits. However in Live Script, you get a nice display if you use. units = 'mm'; % Whatever it is, assuming it's a string. Lastly, assign a new value to the first element in B. ,xM) declares a function named myfun that accepts inputs x1,. First, create an empty table, patients2, by calling table without arguments. For example, if A is a 3-by-4 matrix, then size(A) returns the vector [3 4]. For details, see Select the Systems to Print. 4f in your code, Matlab ignores that ordering. In cell arrays, each string is treated as a separate. T = true (n) is an n -by- n matrix of logical ones. 17,24,1,8,15 23,5,7,14,16 4,6,13,20,22 10,12,19,21,3 11,18,25,2,9. fprintf ('member id %d, :%f ',i,opt); count=count+3; i=i+1; end. Please let me know if this explanation is not clear/enough. You can run the live script from the command line; e. So after my first run of the for loop, the result should be: " At Freq 136, the sum of volt 1 = 55. m exists, then the command type myscript displays the contents of that file. The statistics depend on both the solver and the solver algorithm. To see the current diary log filename, type get (0,'DiaryFile'). fprintf ('ca {1} = %s ca {2} = %d ', ca {1}, ca {2}); s. This makes the code easy to understand and maintain. Answers (1) Walter Roberson on 25 Jan 2016. The fields and values of the options structure correspond to names and values of name-value pair arguments. 3f will give you. It's simple and effective with size(x) but no name or location. I have the following code that I want it to print "Air density = x. x = 1. Each element of C specifies the color for 1 pixel of the image. fig = figure; plot (1:10) print (fig, 'MySavedPlot', '-dpng') Alternatively, refer to a figure using the value of its Number property, which is the integer value that displays in the figure window title bar. 1 Answer. path (newfolder,oldpath) adds the folder newfolder to the beginning of the search path. This MATLAB function returns the scalar 0. For example, X = zeros(3,datatype,'gpuArray') creates a 3. MATLAB: Print the indexes alongside an array. If writetable cannot construct the file name from the input table name, then it writes to the file table. echo toggles on and off echoing for. fprintf ( , p {1}); Sign in to comment. You can also disp a the line break character '\n' with its decimal value: 10. nice to meet you. If you want to change that, you can't, so you will have to flip the array itself: Theme. Hello, How i can publish matlab output and code ". D = C'; fprintf ('%s %s %d %d %d %3. Valid function names begin with an alphabetic character, and can contain letters, numbers, or underscores. The sixth element of the date vector output (seconds) is accurate to several digits beyond the decimal. We can use the fprintf() or disp() methods. Then click 'Apply to Figure' button. Learn more about fprintf, format text, align text, text, text files MATLAB I'm attempting to align certain text in a text file that I'm writing with matlab. Accepted Answer. T = true (n) is an n -by- n matrix of logical ones. One floating point number, y, will be written into the string. You can store numbers between approximately –3. 000 55. This "line" is the MATLAB editor's graphical line to ease with writing and navigating code and as such cannot be navigated to word. Use dot notation to access the Format property to view or. The function returns a truecolor image. Run the command [ imformats(). Mar 26, 2016 · Before you print your document, you need to tell MATLAB how to print it. The function then continues in a similar manner through any additional matrix arguments. Add Subscripts and Superscripts. Before you print your document, you need to tell MATLAB how to print it. Improve this answer. If you are using Image Tool ( imtool ), then you must use the Print to Figure option on the File menu. My issue is creating an fprintf statement that will create a table showing each number in a single line with a province. just two columns, first c. I have a program where the user is asked to define A. Here are two methods that produce that table. s = struct (field,value) creates a structure array with the specified field and value. Field Width. I'm trying to print a multi-line file using the contents of a cell array and a numerical array. Field Width. 4 × 10 using either double or single precision. Hello, in my attached Matlab Code, I would like to run the for loop to carry out the calculation on each of the DataX and then print the result after each iteration. Your second method is also not working because again Dtimes is an array and you cannot use %s to print it. Learn three common ways to print (output) in Matlab: type the name of a variable without a semi-colon, use the disp function, and use the fprintf function with a C printf-style formatting string. If f is a constant, then the default variable is x. Enhancing MATLAB Figures's Quality To Be Included In MS Word, MS PowerPoint or PDF Document. 3 0. In File-->Preference-->Figure Copy Template-->Copy Option I noticed there are 3 options:. Editor also. For text and spreadsheet files, each column of each variable in T becomes a column in the output file. Answers (2) disp (m). 79; 51939 3. 1i returns the basic imaginary unit. To display text in the Command Window, use disp or fprintf. 4 × 10 using either double or single precision. fprintf ('%d rpm = %d rad/s = %d deg/s\n', E. 8000 5. fprintf([repmat('%f\t', 1, size(A, 2)) '\n'], A'); You will have one superfluous tab \t at the end of each line, though: >> A = magic(5) A = 17. Simple ( and ) will work just fine. Using the format function only sets the format for the current MATLAB session. May 14, 2015 · 1 Answer. Accepted Answer. I am unable to print the values in double format, suppose if I have a value b=0. i is equivalent to sqrt (-1). sz is a two-element numeric array, where sz (1) specifies the number of rows and sz (2) specifies the number of variables. Specify the orientation as either portrait, landscape , or tall. Syntax And Parameters. string = 'def';. This becomes more useful for functions that have variable. On Windows, when you fopen () your file then use 'wt' instead of just 'w' to force CR+NL to be output instead of just NL. Accepted Answer. (I used it in the first fprintf call but not in the second. With the theory outlined above, let us now look at the various possibilities for MATLAB print specifications in the MATLAB R2018b user environment. I have a set of 6 figures I would like to print to 3 PDF pages (2 figures per page). Use the MATLAB expression pane to specify the code that executes during publishing. Find the treasures in MATLAB Central and discover how the community can help you! Start Hunting!. Select MATLAB > Command Window, and then choose a Numeric format option. heres what i did: * the variable name of the matrix below is: data_info;. Looking at this link (Unicode Table for Greek Chars), the Unicode for Greek capital Delta (Δ) is U+0394 or 0x0394 hex. Because random numbers play an important role in computer programming, we will learn how to use the MATLAB random number generator. xlsx' ; writetable (T,filename, 'Sheet' ,1, 'Range', 'D1') Write the table T without the variable names to a new sheet. So I can do something like: >> d = datetime ('12:10:00') - datetime ('12:05:00') d = 00:05:00 >> whos d Name Size Bytes Class Attributes d 1x1 128 duration. To create multipage PDFs, set the 'Append' name-value argument to true. Oct 28, 2020 · 1. . mom sex videos