Each of the output arguments needs to be assigned a value somewhere during the execution of the function. 
The entire first comment block is displayed by "help" or "doc". The first comment line is searched by the "lookfor" command, and printed out if any words on the line match. If a function takes no input arguments, the empty parentheses are still required. Pass by reference can be simulated by storing the return value in the same variable that was passed to the function:. All input arguments are passed by value. Any type of data, including vectors and matrices, can be used for either input or output arguments. Data types are not specified for either input or output arguments. Matlab supports multiple input arguments, in a comma separated list within parentheses as shown. ( If not, then Matlab ignores the internal name, which just confuses everything. The name of the function must match the name of the. If a function does not have any output arguments, then neither the square brackets nor the equals sign that follows are used. If a function only has a single output argument, then the square brackets are not required. multiple "return" values ), listed as shown in square brackets. Matlab supports multiple output arguments ( i.e. Matlab functions must begin with the keyword "function". % Additional lines of first comment are reported by "help" % First comment line is reported by "lookfor" The general syntax of a Matlab function is as follows:įunction = functionName( inarg1, inarg2. 
As a consequence, functions have mechanisms for passing arguments into the functions, and for returning the results. Variables defined and used in a function do not affect the regular Matlab workspace. Functions, however, define a separate ( local ) scope. Any variables created get added to the workspace, and may replace other variables that were already defined there with the same names. Ordinary script files have the problem that they run in the scope of the command window. Both are plain ASCII files containing Matlab commands, with ".m" file extensions. Matlab function files are very similar to Matlab script files, with a few important differences. Etter, "Introduction to MATLAB, Second Edition", Section 3.6. Hahn & Valentine, "Essential MATLAB for Engineers and Scientists", Fourth Edition, Chapter 10 up to section 10.3.3.
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