curve fitting with equations

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Alex
Alex 2011-7-11
Hi, I have 5 data points that i want to curve fit. I used the matlab curve fitter to fit it to a fourier series because the model equation i have is periodic (i think). It works, it seems to plot a nice curve through the points.
However I need certain parameters from my equation to use else where in other equations and therefore wanted to curve fit to a "custom equation" however matlab cant converge and I wondered if anyone could help me. my data is % k = [1 2 3 4 5]; % yk = [1.994 1.806 1.632 1.493 1.2];
the equation and parameters I am looking for are func(i) = (1/(a*b))*(c0-asinh(sinh(c0)*exp(a*t*2*pi)))
parameters a, b and c0.
Can anyone shed any light on why matlab possibly cant converge?

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