Matlab Coder ERROR: Dimension _ is fixed on the left-hand side but varies on the right.

I had the same problem in this post but it was in Simulink. I solved that one by using a reshape block.

However, now I am trying to compile a Matlab script using the coder. The script is working without any problem and the variable which is complaining about is not growing. It is defined inside the code as a merge of some others that are not either growing or changing shape.

This is the error:

 Dimension 1 is fixed on the left-hand side but varies on the right ([3 x :? x 4] ~= [:? x :? x :?]).

I tried to use reshape specifying the fixed numbers but even like this it did not like it.

Any suggestions?

[dpb]

And we're supposed to be able to answer something sentient w/o a line of code in sight???

[Dani Tormo]

Well, I cannot paste 1370 lines of code here. Maybe someone can give me a clue of what to check.

[dpb]

There's no cross-reference or code line where the error was generated? You mention the function of the code you're questioning -- at least paste the pertinent stuff around there w/ a few additional lines that show the definitions of the variables involved.

Sounds like a case where Matlab automagic memory reallocation is more than the code generator knows how to handle. You may have to explicitly allocate a target to help it along but there's not much anybody else can do with absolutely nothing to even have a hint over what you're trying to compile...the crystal orb is totally dark on this one, sorry.

[Ketan]

Here are some ideas:

- Are the sizes of any variables dependent on values of any entry-point inputs? In your previous post you mentioned sizing using non-tunable parameters. The equivalent in MATLAB Coder is to specify an input using a coder.Constant.

- You can use the report to trace backwards from the site of the error and analyze the upstream code that is causing the rhs to be inferred as [:? x :? x :?].

[Image Analyst]

You can attach your 1370 lines (your m-file) via the paperclip icon. dpb, you'd better get your advance order in for the Crystal Ball Toolbox because I'm sure it will be a sellout for the first few months.