Find value in interpolated data

Assume I have a vector of data y(nx1) which correspond to a time vector t(nx1).

What I need is some way to find a certain value of y for an arbitrary point of time. Lets say t covers a timespan of 0 to 10 seconds. I want to get the corresponding value of y for t=2.334.

Now if there is a t=2.334 exactly in the time vector I could find the corresponding entry in y. But if one entry reads t=2.1 and the next t=2.5 I don't have a corresponding value.

I would like to interpolate y so that I can find a value for any given time.

However I am fairly new to Matlab. Could someone tell me how to do this the best way?

Answer 1

[Chad Greene]

Use interp1. It's exactly what you need

yi = interp1(t,y,2.2334);

[Jan Wingens]

Thank you very much

[Shubham Wakchaure]

@Chad Greene How to do it for the 3d case ?

[Can]

@Shubham Wakchaure With interp3 of course.

Answer 2

[Kirby Fears]

Check out the interp1 function as well as the spline function.

For your example, you can find the value for t=2.334 given t and y using linear interpolation with interp1:

myval = interp1(t,y,2.334);

Hope this helps.

[Jan Wingens]

Thanks