MATLAB: How to define user-defined code blocks MATLAB

code-blocksMATLABuser-defined

We have code blocks like 'if' and 'while'. Can we create our own code blocks?

If so, could you explain how to do that? Any answer is appreciated, thank you in advance.

Best Answer

If you're trying to overload the end keyword (in the context of an indexing expression for an instance of your user-defined class) follow the instructions on that documentation page for how to do so.

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For all other keywords (as listed in the output of the iskeyword function; some examples are if, for, switch, classdef, etc.) or for overloading end in the context of ending a code block started by another keyword, the first part of the first step to do so is to go here.

Once you have completed the first step, the second step is to discuss your proposed new keyword with your manager and other interested parties. They will walk you through the rest of the steps.

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A less strenuous approach, but one that requires additional time and is not guaranteed to succeed, is to contact Technical Support and ask them to file an enhancement request for your new keyword. Describe what you want that new keyword to do and how you would use it if it existed. The developers will review that enhancement request and may choose to implement that new keyword or a variant of it.

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MATLAB: A function insdie a switch case

You cannot define a function inside a switch-case statement as stated on this documentation page.

"You cannot define a nested function inside any of the MATLAB® program control statements, such as if/elseif/else, switch/case, for, while, or try/catch."

If you want your nested function to be nested inside the function that contains the switch-case statement, define it nested inside that function but outside all control statements

You can call functions inside a case or otherwise section of a switch-case statement or to generate the expression on which you switch. The examples on the documentation page for the switch keyword show this using disp, bar, title, pie3, and warning. So does this example:

switch input('Enter a number: ')
    case 1
        disp('The One')
    otherwise
        warning('Not The One')
end

MATLAB: Is there a way to represent an #ifdef statement in a simulink model

Simulink has conditionals, and Simulink has triggered subsystems, but those require that the control variable be defined (but can differentiate between various values.)

To do an #ifdef you would probably need to have a MATLAB Function block that somehow tested whether that entity was "defined" ... whatever "defined" means in this context. For example with rapid acceleration turned off, the MATLAB Function Block could probably use something like

evalin('caller', 'exists(''NAME'', ''var'')')

You would then use that to as a definite signal controlling something.

However, a lot of the time #ifdef is for blocks of code compensating for different operating systems interfaces, or differences in compilers, and those kinds of things should not generally be emulated at the Simulink level. It might make some sense to want to emulate #ifdef about which interface device to use, but if so then at the Simulink level that would probably be better handled as an defined parameter with different values to control what gets invoked.

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MATLAB: A function insdie a switch case

MATLAB: Is there a way to represent an #ifdef statement in a simulink model

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