This is matlab parallel server quesion

This is matlab parallel server quesion

[Walter Roberson]

My speculation is that the final argument would be the location to assign the output result to.

Answer 1

[Matan Silver]

Hello,

Walter is correct: If you are generating code for a MATLAB function with an output, there are some scenarios in which that will become a "pass by reference" argument that represents the output of the function.

For struct arguments (which it does not look like applies in this case), you can use the PassStructByReference config parameter to influence this behavior for both entrypoint inputs and outputs: https://www.mathworks.com/help/coder/ug/pass-structure-arguments-by-reference-or-value.html#PassStructureArgumentsByReferenceOrByValueExample-5.

The "coder::array" means that particular input (or output) is a dynamically allocated array. To see more information about how to use "coder::array", you can see this doc page:

https://www.mathworks.com/help/coder/ug/use-dynamically-allocated-cpps-arrays-in-generated-function-interfaces.html

The page above also contains an example showing how you can pass a result argument by reference to store the output of the entrypoint.

There are a number of things you can do to influence the generation of dynamically allocated arrays. You could generate C instead of C++, in which case we will generate "emxArray"-style variable sized arrays: https://www.mathworks.com/help/coder/ug/use-c-arrays-in-the-generated-function-interfaces.html. You can also generate "coder::array"-style dynamically allocated arrays with C++ using the DynamicMemoryAllocationInterface parameter on the config: https://www.mathworks.com/help/coder/ref/coder.codeconfig.html#mw_3fc64d5b-5aa4-4a11-bf6b-10e138b71948. Other factors like whether the array is fixed or variable sized, if it has an upper bound on the size, etc., can change the representation of the array in generated code.

Feel free to reply if you have any further questions!

Matan