Finally, comments can be used to aid in debugging, as explained in Debugging M Files. Such text is often found at the end of an M file though also can be found at the beginning. You can mark selected text in the MATLAB comments so that they display in italic, bold, or monospaced text when you publish the file. MATLAB will output the comments leading up to the function definition or the first block of comments inside a function definition when you type:Īll of MATLAB's own functions written in MATLAB are documented this way as well.Ĭomments can also be used to identify authors, references, licenses, and so on. It is common and highly recommended to include as the first lines of text a block of comments explaining what an M file does and how to use it. % Calculate average velocity, assuming acceleration is constant Doing this is a good idea both for yourself and for others who try to read your code. To comment out a large block of code in the Editor or Live Editor, select the code and on the Editor or Live Editor tab, click the Comment button. E.g.Ĭomments are useful for explaining what function a certain piece of code performs especially if the code relies on implicit or subtle assumptions or otherwise perform subtle actions. */ in languages like C or C++, via the % contains any other text (except white spaces). MATLAB also supports multi-line comments, akin to /*. Select the code you wish to comment or uncomment, and then press Ctrl-R ( ⌘-/ for Mac) to place one '%' symbol at the beginning of each line and Ctrl-T ( ⌘-T for Mac) to do the opposite. There are two useful keyboard shortcuts for adding and removing chunks of comments. In the MATLAB Editor, commented areas are printed in green by default, so they should be easy to identify. The % character itself only tells the interpreter to ignore the remainder of the same line. My code looks likes this: fprintf Percent Error: 0.8f, percentError) It is currently printing 'Percent Error: 0.03696863 ', but I need it to print 'Percent Error: 0.03696863'. Fundamentals of MATLAB MATLAB Workspace MATLAB Variables *.mat filesĬhapter 2: MATLAB Concepts MATLAB operator Data File I/OĬhapter 3: Variable Manipulation Numbers and Booleans Strings Portable Functions Complex NumbersĬhapter 4: Vector and matrices Vector and Matrices Special Matrices Operation on Vectors Operation on Matrices Sparse MatricesĬhapter 5: Array Arrays Introduction to array operations Vectors and Basic Vector Operations Mathematics with Vectors and Matrices Struct Arrays Cell ArraysĬhapter 6: Graphical Plotting Basic Graphics Commands Plot Polar Plot Semilogx or Semilogy Loglog Bode Plot Nichols Plot Nyquist PlotĬhapter 7: M File Programming Scripts Comments The Input Function Control Flow Loops and Branches Error Messages Debugging M FilesĬhapter 8: Advanced Topics Numerical Manipulation Advanced File I/O Object Oriented Programming Applications and Examples Toolboxes and ExtensionsĬhapter 9: Bonus chapters MATLAB Benefits and Caveats Alternatives to MATLAB What is Octave ? Octave/MATLAB differencesĬomment lines begin with the character '%', and anything after a '%' character is ignored by the interpreter. I need to have the display window have a '' after the rest of my printing. A block comment has a start symbol and an end symbol and everything between is ignored by the computer. %% Compute z(x, y) = x.Chapter 1: MATLAB Introductions. Specified by the function handle FUNC to arrays A and B, with implicit Y = myFunction(x) applies the element-by-element binary operation MyFunction Binary Singleton Expansion Function Do not include any other text on these lines. Time Symbol 't' You can use the letter t to represent absolute time in simulation targets. These uses are described in the topics that follow. ,, //, /,, F, and hexadecimal notation to provide the user with special features in action language notation. While commenting a block of code can be done by adding a % symbol at the beginning of each line, newer versions of MATLAB (after 2015a) let you use the Block Comment Operator % operators must appear alone on the lines. Action Language (Stateflow) Special Symbols Stateflow notation uses the symbols t,. To uncomment a previously commented line remove the % symbol or use shortkey Crtl+T. It is helpful for others and even for the coder when returned later.Ī single line can be commented using the % symbol or using the shortkey Ctrl+R. It is a good practice to add comments that describe the code. This page contains a comprehensive listing of all MATLAB ® operators, symbols, and special characters.
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