'Matlab Coder' generated code is NEVER of double type (only real_T)

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Viren
Viren 2013-12-4
编辑： Mike Hosea 2013-12-26
I'm trying to convert a piece of matlab code into C++ code. I have one large vector (100+ elements) as input and one large vector as the output. Now, when I try to build the code using the Matlab Coder, while explicitly specifying that the input variable (u) is a DOUBLE, Matlab just seems to ignore my demands and does its own thing by creating the function with input variable of the type const real_T type instead.
This would not be so bad except that I need to use the resulting code with the Legacy_Code function in order to create an S Function. What can I do?
[Attached screenshot shows what is wrong]

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采纳的回答

Walter Roberson
Walter Roberson 2013-12-4
See http://www.mathworks.com/matlabcentral/answers/102245
and see the "19" answer at http://stackoverflow.com/questions/2386772/difference-between-float-and-double.
Notice that if you do not include the include file indicated there, you could go ahead with the legacy code tool and create the equivalence: http://www.mathworks.com/help/simulink/slref/legacy_code.html
legacy_code('compile', specs, compilerOptions)
example:
legacy_code('compile', s,...
{'-DCOMPILE_VALUE1=1', '-DCOMPILE_VALUE2=2',...
'-DCOMPILE_VALUE3=3'});
So you could '-Dreal_T=double'

更多回答（3 个）

Ryan Livingston
Ryan Livingston 2013-12-5
Also if you are using MATLAB Coder in R2013b, you can request that C built-in types be used in the generated code for LIB, DLL and EXE targets:
http://www.mathworks.com/help/coder/ug/build-setting-configuration.html#btybyd5
That will use 'double' rather than 'real_T' in the generated code.
Viren
Viren 2013-12-4
Ah. Makes sense. I actually knew that real_T was the catch-all data type that matlab has, and I was making another error in my code. Never mind that. Thanks for your prompt reply. Answer accepted.
Viren
Viren 2013-12-5
That's even more useful. This is what I should have done in the first place. I must say I had nearly given up on the Matlab community, but you guys have saved the day! Thanks very much.

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