Problems with exponential fit.
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I start with the following data:
x,y
0.0025,10
0.001818,100
0.001429,10000
And try to fit to rate=a*exp(bx) using the following code:
p=fit(x,y,'exp1');
p2=coeffvalues(p);
yfit=p2(1)*exp(p2(2)*x);
semilogy(x,y,'.',x,yfit)
and get a poor quality fit along with values that do not make sense. It really underestimates y for larger x.
Excel’s exponential fit seems reasonable.
Any ideas why the Matlab fit does not work. I was working with small x values so I multiplied by 1000 but it had no effect.
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