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Avoiding loop stats [message #52155]

Fri, 19 January 2007 09:43

yp
Messages: 42
Registered: February 2005

Member

IDL Gurus,
There is perhaps a smart solution to this problem, but I could not
figure out.
I have a series of EO images (2D) stacked over time which makes the
data a 3D array of [4000, 2000, 900] i.e., [lon,lat,time]
I need to compute various statistical parameters at each pixel over
time and produce each of them as [4000,2000] array.

for i=0,4000L-1 do for j=0,2000L-1 do data_st(i,j)=st_func(data(i,j,*))

where, data=FLTARR[4000,2000,900]
data_st is the output from a function 'st_func' which works with vector
data only.

Is there a way to do this avoiding the 4000x2000 loop? It is painfully
slow on windows.
thanks in advance

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