[Senbonzakura]

This might be a very silly question.

I am using Matlab to calculate various statistical terms like correlation coefficient, autocorrelation etc. from a set of PIV data for a round jet (I have U and V instantaneous at different x and r, with data over 1000 images taken at 50Hz). Now the fluctuations vary with time, x (axial distance from origin), and r (radial distance).

If I am finding out, let's say the correlation coefficient between the fluctuating terms u and v (axial and radial), I am confused as to how to do it (I know matlab has a built in function for corr coef.)

I want to plot corr coef vs r/D . So, I need to provide Matlab with vectors of u and v. But these vectors should vary with x or t?

In S.B.Pope's book, there is a part about one point one time characteristics. But, if that is so, then corr coef in this situation is not going to be possible?