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How can I interpolate my data?

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Moj
Moj 2014-12-9
编辑： Mohammad Abouali 2014-12-9
Dear community,
I have two matrices which are:
x = [0,3e-5, 7e-5, 2e-4, 6e-4, 0.002, 0.006, 0.01, 0.02, 0.03, 0.05, 0.07];
y = [1.1195e6, 1.1195e+06, 1.1195e+06, 1.1195e+06, 1.1195e+06, 1.1194e+06,1.1192e+06, 1.1190e+06, 1.1184e+06, 1.1177e+06, 1.1161e+06, 1.1141e+06];
My question is how can I interpolate my data? and how can I find this function?
Thanks in advance.

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采纳的回答

Mohammad Abouali
Mohammad Abouali 2014-12-9
Use interp1(). this seems the most appropriate one for your data set.
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Mohammad Abouali
Mohammad Abouali 2014-12-9
编辑：Mohammad Abouali 2014-12-9
Question by Moj: For example I want to know the value of y for x = 4e-5. How can I find this?
Answer
y_interpolated=interp1(x,y,4e-5);
y_interpolated would have the interpolated value at x=4e-5;
if you want spline interpolation you can define the method:
y_interpolated=interp1(x,y,4e-5,'spline');

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更多回答（1 个）

matlabuser12
matlabuser12 2014-12-9
http://www.mathworks.com/help/matlab/math/interpolating-scattered-data.html
what do you mean by interpolate this data and find a function? Do you mean fit a curve to this and find the function? interpolation means finding data points within your set that arent there based on the data around that point.
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Moj
Moj 2014-12-9
For example I want to know the value of y for x = 4e-5. How can I find this?

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