Hi Alireza,
The "emxArray_real_T" type indicates that the code generator does not know what is the maximum number of elements in "y". That is, it thinks that the number of elements in y may change from run to run, and it could not figure out an upper bound for it.
You could help the code generator to understand that y is bounded by using one of the techniques here:
If that does not help, maybe can attach the example you have (and the command line arguments you use) so that someone could take a closer look.
You also mentioned that the emxarray type creates an issue on the microcontroller. Why is so? That type is just a plain C struct type, and there is a header file that defines it, all you need to do is to make that header file available to your C compiler.
