FREEMAT TUTORIAL PDF

They all differ in their capabilities—some extending beyond what is available in MATLAB, and others giving subsets of functions that focus on some problem area. In this article, let's look at another available option: FreeMat. Installation for most Linux distributions should be as easy as using your friendly neighborhood package manager. Once it's installed, you can go ahead and start it up. This brings up the main window with a working console that should be displaying the license information for FreeMat Figure 1.

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FreeMat v4. Also, FreeMat works like C in that the caller does not have to supply the full list of arguments. Also, when keywords see help keywords are used, an arbitrary subset of the parameters may be unspecified. To assist in deciphering the exact parameters that were passed, FreeMat also defines two variables inside the function context: nargin and nargout , which provide the number of input and output parameters of the caller, respectively.

See help for nargin and nargout for more details. In some circumstances, it is necessary to have functions that take a variable number of arguments, or that return a variable number of results. In these cases, the last argument to the parameter list is the special argument varargin. Inside the function, varargin is a cell-array that contains all arguments passed to the function that have not already been accounted for. Similarly, the function can create a cell array named varargout for variable length output lists.

See help varargin and varargout for more details. The function name fname can be any legal FreeMat identifier. Functions are stored in files with the. Note that the name of the file and not the function name fname used in the declaration is how the function appears in FreeMat. So, for example, if the file is named foo.

Note that this is only true for the first function that appears in a. Additional functions that appear after the first function are known as helper functions or local functions. These are functions that can only be called by other functions in the same. Furthermore the names of these helper functions are determined by their declaration and not by the name of the. An example of using helper functions is included in the examples.

Another important feature of functions, as opposed to, say scripts , is that they have their own scope. That means that variables defined or modified inside a function do not affect the scope of the caller. That means that a function can freely define and use variables without unintentionally using a variable name reserved elsewhere. The flip side of this fact is that functions are harder to debug than scripts without using the keyboard function, because the intermediate calculations used in the function are not available once the function exits.

Examples Here is an example of a trivial function that adds its first argument to twice its second argument: addtest. A first attempt at doing so has no effect: addtest2. We can change that by passing the first argument by reference: addtest3. However, the second call succeeds, and note that arg1 has now changed.

Note: please be careful when passing by reference - this feature is not available in MATLAB and you must be clear that you are using it. As variable argument and return functions are covered elsewhere, as are keywords, we include one final example that demonstrates the use of helper functions, or local functions, where multiple function declarations occur in the same file.

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FreeMat, Octave, MatLab, and SciLab Free Tutorials

FreeMat v4. Also, FreeMat works like C in that the caller does not have to supply the full list of arguments. Also, when keywords see help keywords are used, an arbitrary subset of the parameters may be unspecified. To assist in deciphering the exact parameters that were passed, FreeMat also defines two variables inside the function context: nargin and nargout , which provide the number of input and output parameters of the caller, respectively.

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FreeMat—Yet Another MATLAB Replacement

FreeMat is a free environment for rapid engineering and scientific prototyping and data processing. FreeMat is available under the GPL license. We are pleased to annouce the release of FreeMat 4. This version includes a number of bug fixes and some cleaned up tests and documentation.

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