Subscripting into an mxArray is not supported

This is the part where i am getting error while converting to C code using Codegen.

            w = 1;  
            yw1 = zeros(3,3);
            r2 = 1;
            c2 = 1;
            for r3 = (r1-w) : (r1+w)
                for c3 = (c1-w) : (c1+w)
                    _ *yw1(r2,c2) = y1(r3,c3);* _
                    c2 = c2 + 1;
                    if(c2 > g)
                        c2 = 1;
                    end
                end
                r2 = r2 + 1;
            end

And y1 is a 512x512 matrix.

[Erik S.]

Hi,

In the second for loop you have underlines and stars, what are those? How does your C code look like?

[Gautham Nachimuthu]

underlines and stars indicate bold and italicised text just to mark that line where i'm getting error.

Answer 1

[Ryan Livingston]

It sounds like you are using an extrinsic function and need to pre-assign the output.

Please see this similar question for more details on doing so.

[Gautham Nachimuthu]

But my array have to change its size for every iteration.. (like a runtime one). What can i do?

[Ryan Livingston]

You can use coder.varsize to declare the output to be variable size:

coder.varsize('y');
y = zeros(...);
y = callExtrinsicFunction(...);

[Gautham Nachimuthu]

thanks a lot sir.. i'll try this out and let u know....