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What kind interpolation function need be used?
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HI
What kind of interpolation function can be used for the data looks like in the graph.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/147228/image.png)
I am using the interp1 function, some one said that I cant use it becuase the data is not monotonic.
Is there any function to deal with these kind of data?
my code is
A=xlsread('interpolation.xlsx','sheet1','A:A')
B=xlsread('interpolation.xlsx','sheet1','B:B')
x=0.2:0.1:0.5
D=interp1(B,A,x)
Thanks in advance..
3 Comments
John D'Errico
on 21 Feb 2015
Edited: John D'Errico
on 21 Feb 2015
What does it mean to interpolate a function that has multiple values for a given value of x?
While there are ways one can interpolate such non-monotonic curves, it does not appear that you know what you want to do here. In fact, I've written such a tool. But first, we need you to understand what you are doing, or we need to understand what it is you want.
One possibility for example, is to just smooth the curve you have.
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