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From: Alex Thompson on 3 Jun 2010 14:20
Hello, I am quite new to matlab and I am trying to troubleshoot my program, without much success. Basically I am trying to use lsqcurvefit to fit a curve to a data set, and each data set will have a constant value named "dip" associated with it. "Dip" is part of the function I am trying to optimize, however it seems that the lsqcurvefit does not recognize it as a already declared value and issues an error saying that it is an undeclared function of variable. I seem to be having a hard time describing this, so here's a portion of my code below.

% Inputs, retrieves most from file called “data”;
zi=data(:,1);
ui=data(:,2);
height= data(1,3);
dip=0.6745*height;

fun = inline('0.23395*(log(zi./p(1)) - ((zi-p(1))./( dip -p(1))).^3./3) + p(2).*sin(pi.*(zi-p(1))./2./( dip - p(1))).^2','p','zi');
p0=[0.1,0.328];
p = lsqcurvefit(fun,p0, zi, ui);

I have tried a couple of things, but they haven't been successful, so any help would be appreciated.
Thanks,
Alex
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Prev: unilateral Z trans
Next: Passing a value to Lsqcurvefit