Stateflow Runtime Error (chart): Matrix(matrix) subscript turned out to be a vector(vector) subscript with shape different from compiled assumption.

Hello, I have been trying to run a MATLAB function block in simulink with variable size input and output data. The compilation was successful but I get a run time error stating:

Stateflow Runtime Error (chart): Matrix(matrix) subscript turned out to be a vector(vector) subscript with shape different from compiled assumption. The error is present in the following line:

[crcDetCbData, crcCbFlags(cbIdx),iters(cbIdx)] = step(turboobject, in, intrlvIndices);

where turboobject is an instance of commLTETurboDecoder, in -input data intrlvindices is the indices for interleaving.

the function file runs without any error in MATLAB. But when I implement the same in Simulink I get the above error.

I am using this model for my project. It would be very helpful if anyone can provide a solution the earliest.

Answer 1

[Ryan Livingston]

The issue is described in detail, with workarounds, in the documentation:

http://www.mathworks.com/help/coder/ug/limitations-with-variable-size-support-for-code-generation.html#br952r_

In short, when indexing with non-scalars, the output generally has the size of the index, unless the array being indexed is a vector. To generate more efficient code with variable-sized arrays, the requirements are made more strict for code generation.