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December 14th, 2016, 02:41 PM   #1
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Approximation with matlab

Hi guys.
I'm dealing with an approximation problem.
Given is the data of the B-H curve of a core material (M4 steel):
https://www.dropbox.com/s/r8da63kxg6n9ou4/BH.mat?dl=0
The BH curve can be plotted using Matlab (blue):





I've tried to approximate it with this function (red):
$\displaystyle B(H)_{approx} \; =1.62 \cdot (1-e^{-\frac{H}{11.4}} \quad);$

but the result is not good enough.
The area that is important to me is marked green, I need the approximation to be as good as possible in this area. Can some one please show me how. I'd really appreciate it. Thanks a lot.
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