The generated code will take the size as an argument. Suppose we have the function:
function y = varsize(x)
y = 2*x;
and generate code:
codegen varsize -args {coder.typeof(1,[80,80],[true,false])} -config:lib
The signature of the entry-point function in the generated code is:
void varsize(const double x_data[], const int x_size[2], double y_data[], int
y_size[2]);
so that the caller passes in x_size to specify the size of x. The generated code sets y_size to the size of the output so that the calling C code knows how large y is.
In some instances, the generated code will use structs to represent arrays. When this is the case, the size vectors will be embedded inside of the structure arguments:
void varsize(const emxArray_real_T *x, emxArray_real_T *y);
where emxArray_real_T is a struct that contains double data, a size vector, and other data.
