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December 14th, 2016, 01:41 PM   #1
Joined: Dec 2016
From: Switzerland

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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):
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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