Linear piecewise interpolation problem

2013 10 30
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更新时间：2013 10 31
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Hello. I would like to make a interpolation to my data that I obtain from qqplot in MATLAB . I would like to have eg. three interpolation best fitted lines. Here is my data in represented by qqplot. Any ideas how to simply do this?

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Matt J
Matt J 2013-10-30

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Jonasz
Jonasz 2013-10-30
编辑：Matt J 2013-10-30
I need something else. I need to put a lines into this plot so it will show me three different lines like this
But how to code this?
Matt J
Matt J 2013-10-30
Once BSFK gives you the pp-form just evaluate it at 2 points between each of the knots. Then you can use polyfit() to fit a line to each pair of points and plot.
Jonasz
Jonasz 2013-10-30
Could you explain it more ? I don't understand it. What is my input of bsfk ? I have only one column of values.
Matt J
Matt J 2013-10-31
The documentation for bsfk should explain everything.

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Jonasz
Jonasz
2013-10-30

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Matt J
Matt J
2013-10-31

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