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Circular convolution using DCT and DST

from Circular convolution using DCT and DST by Reju VG
circular convolution using Discrete sine and cosine transforms

dsS2e=dS2e(s) 
function dsS2e=dS2e(s)
N=length(s);
sS2e=DST2e(s); %n=0:N-1, k=1:N

if rem(N,2)==0  %For even N

    temp=sS2e(2:2:end-2);
    dsS2e=[0; temp; sS2e(end); flipud(temp); 0];
      
else    %For odd N
   
    temp=sS2e(2:2:end-1);
    dsS2e=[0; temp; flipud(temp); 0];
    
end

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