# freq. components of a matrix

Started by December 15, 2003
 Hi, I want to find fractions of vertical and horizontal frequencies of "a" by the following commands: a= 1 4 7 10 2 5 8 11 3 6 9 12 13 14 15 16 pt(a); % fft of the matrix "a" in row-direction aT=a.'; qt(aT); % fft of "a" in column-direction K=sqrt(p.^2+q.^2); % total frequency u=j*p/K; % freq. of rows v=j*q/K; % freq. of columns, where j=sqrt(-1) Here Matlab returnes inf-values for u and v! It also produce an error message I don't understand: (Warning: Matrix is singular to working precision.) (Type "warning off MATLAB:singularMatrix" to suppress this warning.) Anyone can please tell me why I get u and v to be inf-values? or how I can get the u and v without this error in matlab? thanx a lot
 chek out fft2 --- kianogo <> wrote: > Hi, > > I want to find fractions of vertical and horizontal frequencies of > "a" by the following commands: > a= > 1 4 7 10 > 2 5 8 11 > 3 6 9 12 > 13 14 15 16 > > pt(a); % fft of the matrix "a" in row-direction > aT=a.'; > qt(aT); % fft of "a" in column-direction > K=sqrt(p.^2+q.^2); % total frequency > u=j*p/K; % freq. of rows > v=j*q/K; % freq. of columns, where j=sqrt(-1) > > Here Matlab returnes inf-values for u and v! It also produce an > error > message I don't understand: > (Warning: Matrix is singular to working precision.) > (Type "warning off MATLAB:singularMatrix" to suppress this > warning.) > > Anyone can please tell me why I get u and v to be inf-values? or > how > I can get the u and v without this error in matlab? > > thanx a lot > ===== - Its not life that weighs us down, Its how we carry it. __________________________________