How can I interpolate my data?

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.

Answer 1

[Mohammad Abouali]

Use interp1(). this seems the most appropriate one for your data set.

[Mohammad Abouali]

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');

Answer 2

[matlabuser12]

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.

[Moj]

For example I want to know the value of y for x = 4e-5. How can I find this?