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Floating point error [message #34747]

Fri, 11 April 2003 14:19

K. Bowman
Messages: 330
Registered: May 2000

Senior Member

I am trying to scatter a vector "data" into an array "array" using array
subscripts. "data" contains some NaNs.

This causes floating point exceptions, even though no "operation" is
taking place.

IDL> help, i, j, h, data, array
I LONG = Array[176779]
J LONG = Array[176779]
H LONG = Array[176779]
DATA FLOAT = Array[176779]
ARRAY FLOAT = Array[720, 160, 24]
IDL> array[i,j,h] = data
% Program caused arithmetic error: Floating illegal operand
IDL> q = data ;Copy data
IDL> q[*] = 0.0 ;Get rid of NaNs
IDL> array[i,j,h] = q ;No problem

If this is a feature, it is going to make using NaNs very difficult.

Ken

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