#Matlab return code#

This will speed up execution, though in most cases the difference is negligible.

It is possible to pre-compile Matlab m-files into p-files, using the 'pcode' command.

Normally this occurs automatically as needed, and happens so fast that you never notice it.

#Matlab return code#

Before Matlab code can be executed, it must be compiled, which creates a binary instruction version of the Matlab commands.

If a subdirectory is named 'private', then functions in that directory are only accessible from functions in the parent directory of the private subdirectory.

Subfunctions are only accessible from other functions within the same file.

The syntax of subfunctions is the same as for the primary function, except with different function names.

Additional subfunctions may follow the primary function in the file.

The first function in an m-file is the primary function, whose name must match the file name.

From within the function, you can determine the actual number of arguments passed for input and for output with the special Matlab variables 'nargin' and 'nargout' respectively.

Omitted arguments are left off from the end of the list.

In this case, the arguments passed are matched with the function arguments from the beginning of the arguments list.

It is possible to call Matlab functions with a smaller number of arguments than what is defined in the function.

Try saving the file to your working Matlab directory and then running 'lookfor polynomial', 'help quadratic', and 'doc quadratic'.Д¬hecking the Number of Arguments Passed In or Out

quadratic.m evaluates a quadratic equation.

( Equivalent to 'static' local variables in C/C++ )

Local variables may be declared 'persistent', which will cause them to remember their values from one function call to the next.Alternatively the 'return' statement can be used to force an early return, ( usually under the control of an 'if' statement.

Functions normally return automatically when the end of the file ( function ) is reached.

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:ДЇunction = 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.