Matlab Coder : Error using interpolation function interp1(x,y,z,'spline');

Asked by Alok Pathak on 7 Jul 2015

Latest activity Answered by Mike Hosea on 7 Jul 2015

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I am writing a signal processing based algorithm using MATLAB which involves using spline interpolation. It runs perfectly on MATLAB. I am attempting to generate the C++ code for my algorithm. The issue is the following :

In the following line of code :

Vector_A(:,1) = interp1(Matrix_B(:,1),Matrix_B(:,2),equi_sample,'spline');

The matrices and vectors have the following dimensions:

Vector_A = (1024,1);

Matrix_B = (843,2);

equi_sample = (1024,1);

'spline' = (:inf,:inf);

Due to this, I am getting the following error,

Subscripted assignment dimension mismatch (size [1024 x 1] ~= size [:? x :?]).

Can you please help me out to make sure I am able to use interpolation for generating C++ code.

Many Thanks

Regards

Alok

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Answer by Mike Hosea on 7 Jul 2015

This all works fine for me. I just tried it in 15a. INTERP1 doesn't need to do anything fancy to figure out the size of the output--it's just the size of equi_sample in this case. I'm going to need more code to figure this out. Make sure you're not using coder.varsize or computing equi_sample in a way that would result in a size that isn't constant.

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