MATLAB: Interpolation in a vector

Question

Hey

I have a vector like this:

v = [1 24 56 87 98 45 67 89 34 56]

and my time axis;

t = [1 2 3 4 5 6 7 8 9 10]

If a want to interpolate the value at time point t=9, how can I do that?

Thanks in advance

Answer 1

I am assuming here that you want to replace the sample corresponding to t=9 using linear interpolation. The following line of code may be helpful in solving this.

newValue = interp1([1:8 10], [v(1:8) v(10)], 9);

It is also possible to change the interpolation technique by specifying it as an additional input argument. For instance, if ‘pchip’

technique is to be used,

newValue = interp1([1:8 10], [v(1:8) v(10)], 9, 'pchip');

Please refer to the following documentation link on “interp1()” for any further clarifications

https://www.mathworks.com/help/matlab/ref/interp1.html#btwp6lt-5

Hope this helps!!