MATLAB: Plz help me sorting the error…

debugerror

the code i wrote is:
S(y,x)=0.125*f(y,mod(x-p-2,N)+1)+...
                 0.375*f(y,x)+...
                 0.375*f(y,mod(x+p,N)+1)+...
                 0.125*f(y,mod(x+p*2+1,N)+...
                 0.125*f(mod(y-p-2,N)+1,x)+...
                 0.375*f(y,x)+...
                 0.375*f(mod(y+p,N)+1,x)+...
                 0.125*f(mod(y+p*2+1,N)+1,x));
here f() corresponds to my input image
error shown is:
   Attempted to access f(1,169.125); index must be a positive integer or logical.
 Error in dyadicAnalysis (line 29)
            S(y,x)=0.125*f(y,mod(x-p-2,N)+1)+...
here p=2^j-1; where j is a loop variable starts from 1 and end at log(N)/log(2)
N=sizef(1), sizef=size(f);
can anybody tell me what is the problem in it? i've tried floor but the error remains the same

Best Answer

There is no 169.125'th element of a matrix. You can access element # 169 or 170, but if you want to get 169.125 then you'll have to do interpolation.
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