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PIVMat 3.02

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PIVMat 3.02

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27 Apr 2006 (Updated )

A PIV Post-processing and data analysis toolbox

tempcorrf (PIVMat Toolbox)
tempcorrf (PIVMat Toolbox)
PIVMat Function Reference<< Prev | Next >> 
tempcorrf
Temporal correlation function of vector or scalar fields

Description
COR = tempcorrf(F) computes the temporal correlation function of the 
vector or scalar fields F.  For a scalar field w(t), 
   COR.f = < w (t) w(t+T) >, 
where T is the time lag, and <.> is the time average over t. 
For a vector field, COR.f is the sum of the correlation for each 
component of the vector (works with 2- and 3-component fields). 
T takes integer values between 0 and LENGTH(F)-1. 
 
COR is a structure which contains the following fields: 
  t:       time lag T (integers between 0 and LENGTH(F)-1) 
  f:       correlation function 
  unitf:   unit of correlation function 
  namef:   name of correlation function 
 
COR = tempcorrf(F, 'norm') normalizes the correlation function, so 
that f = 1 at T = 0. 
 
Note that the convergence of the correlation function is not garanteed, 
especially at large time lags T, for which few data points are 
available to compute the correlation. 
 
If no output argument, the correlation function is plotted. 
 
Example
 
   v = loadvec('*.VC7'); 
   cor = corrf(v); 
   plot(cor.t, cor.f, 'o-'); 
 
See Also
corrf, tempspecf. 
 
Published output in the Help browser 
   showdemo tempcorrf 

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