Coder Error Matlab Function

Hi all,

Here is my code

%#eml
function y = m_FFT1(u)
%#codegen
x=u;
Fs=128;   %sampling frequency
Ts=1/Fs; %sampling period
N=128;    %Sampling point
x=complex(zeros(N,1));
Xre=complex(zeros(N/2,1));
Xim=complex(zeros(N/2,1));
Xre1=complex(zeros(N/2,1));  
Xim1=complex(zeros(N/2,1));
sum_all=complex(zeros(N/2,1)); 
sum_odd=complex(zeros(N/2,1));
sum_even=complex(zeros(N/2,1));
for k=0:N/2-1
%    Xre=0; %each one always reset the sum 
%    Xim=0;
%    Xre1=0; 
%    Xim1=0;
 for n=0:N/2-1
     %DFT even of x[n]
     Xre = Xre+x(2*n+1)*cos(2*pi*k*n/(N/2))/N;
     Xim = Xim+x(2*n+1)*(-1j)*sin(2*pi*k*n/(N/2))/N;
     %DFT odd of x[n]
     Xre1 = Xre1+x(2*n+2)*cos(2*pi*k*n/(N/2))/N;
     Xim1 = Xim1+x(2*n+2)*(-1j)*sin(2*pi*k*n/(N/2))/N;
 end 
   sum_even(k+1) = (Xre+Xim);  
   sum_odd(k+1) = (cos(2*pi*k/N)-1j*sin(2*pi*k/N))*(Xre1+Xim1);
   sum_all=(sum_even+sum_odd);
end
y = sum_all;
end

Then display these errors

   The right and left hand sides must have the same number of elements.
  Function 'm_FFT1' (#44.747.772), line 30, column 6:
  "sum_even(k+1) = (Xre+Xim)"
  Launch diagnostic report.

Another mistake

The right and left hand sides must have the same number of elements.
Function 'm_FFT1' (#44.781.840), line 31, column 6:
"sum_odd(k+1) = (cos(2*pi*k/N)-1j*sin(2*pi*k/N))*(Xre1+Xim1)"
Launch diagnostic report.

Can anyone help me? Thanks a lot!

[Rena Berman]

(Answers dev) Restored question.

Answer 1

[Walter Roberson]

You defined

Xre=complex(zeros(N/2,1));
Xim=complex(zeros(N/2,1));

so Xre and Xim must be vectors (unless N=2 that is)

Then you have

sum_even(k+1) = (Xre+Xim);

With the Xre and Xim being vectors, adding the two of them will give a vector. And you are trying to store that vector into sum_even(k+1) which is a single location, a scalar.