Operate on coder.Constant types for global variables in Matlab Coder

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Philip Bergander 2019-5-9

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https://ww2.mathworks.cn/matlabcentral/answers/461087-operate-on-coder-constant-types-for-global-variables-in-matlab-coder

评论： Ryan Livingston 2019-5-10

Say I want 2 global variables as -globals input to a codegen in Matlab Coder. The first is is a coder.Constant, and the second depends on the first, eg:

g1 = coder.Constant(3);
g2 = g1+1;
codegen example -globals {'g1',g1,'g2',g2}

This will give the error message "Undefined operator '+' for input arguments of type 'coder.Constant'."

Is there any way to operate on coder.Constant variables?

I know there is a very simple work around for this example, but for my code it would be a lot neater to operate directly on g1.

Alternatively:

Is it possible to extract the value in g1 as a normal data type? Eg the following:

a = double(g1);

But this returns the error message: "Conversion to double from coder.Constant is not possible."

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Philip Bergander 2019-5-10

The .Value field solves my problem entirely! Thanks a lot, Ryan!

It would still be interesting with an answer to my first question though.

Ryan Livingston 2019-5-10

Is the first question: Is there any way to operate on coder.Constant variables?

If so, then there's no direct way to operate on coder.Constant values apart from extracting the Value field. We've made a note to think about what operating on these would mean and if we could support something like that.

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