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array averaging [message #67681]

Thu, 13 August 2009 01:49

Lasse Clausen
Messages: 22
Registered: August 2001

Junior Member

Hi there,

I have particle distribution functions measured by a spacecraft in a
4D array. The dimensions are energy, azimuth, polar angle and time.
This array contains NaNs. I would like to average over, say, all
azimuthal angles such that I get a 3D array. The totalling up is
easily done like so

PSD FLOAT = Array[31, 16, 8, 2693]
tot_azi_psd = TOTAL(psd, 2, /NAN)

However, I need to divide this number by the number of non-NaN values
in each, well, column, row, whatever you like to call it, of azimuths.
I struggle to find an easy way to determine this without looping
through all dimensions. Obviously, I can find the indices of the NaN
using WHERE, but so far that doesn't help me.

Any ideas?

Cheers
Lasse Clausen

PS: The MEAN function has a /NAN switch, but unfortunately no
dimension keyword.

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By: Lasse Clausen on Thu, 13 August 2009 01:49

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