Graphing two different data sets against time

[GeorgeEllwood]

Hello,
I was wondering if someone can help me with this question.
I'm doing some mechanical testing and for reasons that I won't go in to, I've got the stress data against time in one file and the strain data against time in another file. I would like to plot stress against strain on a graph. My problem is that the data aquisition rate is different between the stress and the strain, so it's not easy to plot one against another. Is it possible to get Matlab to interpolate for me between the two graphs? I could write a program to do it but I was wondering if there was a function that would just work.
Thanks
George

 

[MikeyP]

Yes, "interp1" (that's a digit one on the end) is the function you need.
If one of the signals will be undersampled then you will need to filter it first to avoid aliasing. I would recommend oversampling the signal with the lower acquisition rate to have the same rate as the signal with the higher acqusition rate.

M

--
Dr Michael F Platten

 

[GeorgeEllwood]

Thanks Michael, I got it working just the way you recommended.
Cheers
George