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**Technical discussion about Matlab and issues related to Digital Signal Processing.**

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Hi Dear I am wondering if anybody would know how to fit a set of data (x, y) with a custom equation. The equation is: y=k*{2*(a-b)-(sin(2*a)-sin(2*b))}, where 'a' and 'b' is function of 'x' but both 'a' and 'b' have separate boundary conditions. In effect, the angle 'a' and 'b' has a phase difference. 'k' is a constant. I really appreciate your reply. I would like to know if i could used some other package. regards Faisal

Hi Faisal, I have done something similar using Mathematica, its very simple, try this http://reference.wolfram.com/mathematica/ref/FindFit.html Not sure in Matlab, maybe try fsolve ! Let me know if this helps. Good luck, Tilak On 7/8/09, Faisal, Nadimul H <n...@gmail.com> wrote: > Hi Dear > I am wondering if anybody would know how to fit a set of data (x, y) with a > custom equation. > The equation is: > > y=k*{2*(a-b)-(sin(2*a)-sin(2*b))}, where 'a' and 'b' is function of 'x' but > both 'a' and 'b' have separate boundary conditions. In effect, the angle 'a' > and 'b' has a phase difference. > 'k' is a constant. > > I really appreciate your reply. I would like to know if i could used some > other package. > > regards > Faisal >

Hi I am trying to take log of an image data, it comes up with an error like Function 'subsindex' is not defined for values of class 'struct' I am not sure what actually this error is. could you please someone advise me with reasons for error, data = dataread('C:\Users\afn_006.nii'); data2=log(data) thanks hek