How can I covert a Matlab struct 1x1 to C++ without an error?

Hi,

I tried to generate C++ from Matlab with the Matlab coder. But I always got an error.

The error is:

>> coder -build test_struct.prj ??? This structure does not have a field 'fs'.

Error in ==> gen_strucht Line: 3 Column: 15 Code generation failed: Open error report.

Here is the Matlab-Code:

 function [test_struct] = gen_strucht(test)
 test_struct.x=test.fs;
 test_struct.y=test.ts;
 test_struct.a=test.modfac;
 test_struct.q= test_struct.x * test_struct.a;
 end

So what can I do?

Thanks for help.

Answer 1

[Kaustubha Govind]

Have you already specified the input structure type in the project?

[Conrad]

Yeah the input is defiend as double.

[Kaustubha Govind]

Don't you need to define it as a structure, and not as double? See How to Add a Field to a Structure to see how you can define the various fields in the structure.

[Conrad]

Thanks for the tipp. So i defined the input value as a struct and I defined the different fields. But now I got the same error for the output field 'q'. Is there a way to define the output value/fields?

[Kaustubha Govind]

Conrad: MATLAB Coder should automatically determine the output type, so you shouldn't have to specify it. Could you paste the exact error message that you get?

Answer 2

[Conrad]

There I think is my second problem. In this struct I have double and chars, and I can only define one type. Is it possible to define a second type?