' CODER.VARSIZE is not applicable to 'mxArray' problem while trying to use MATLAB Coder

I seem to be getting the error of

' CODER.VARSIZE is not applicable to 'mxArray'. ' when using the Matlab Coder function

I'm currently trying to convert my image processing program into a C static library. I have attached a screenshot of the problem.

All help and suggestions are appreciated!

Answer 1

[Arnab De]

The value of the variable pre_img comes from the output of some extrinsic function. Such variable are of 'mxArray' type. If you want to use coder.varsize on such variables. you need to pre-define the variable.

This answer covers it in more detail:

http://www.mathworks.com/matlabcentral/answers/13297-subscripting-into-an-mxarray

And some documentation on this:

http://www.mathworks.com/help/simulink/ug/calling-matlab-functions.html#bq1h2z9-47