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NaN problem in integer arrays [message #86206]

Thu, 17 October 2013 08:44

galaxytraveler42
Messages: 5
Registered: October 2013

Junior Member

I use NaN's a lot in my arrays in place of missing or bad data points, but I have problems with it everytime my arrays are integer.

An example of a test program:
x=[0,1,2,0]
s=where(x EQ 0,count)
if count gt 0 then x(s)=!Values.F_NAN
help, X

> X INT = Array[4]

print, X
> % Stop encountered: test.pro
> % Program caused arithmetic error: Floating illegal operand

And if I change it to a long array:
x=long(x)
then I get:
> X LONG = Array[4]
> -2147483648 1 2 -2147483648
> % Program caused arithmetic error: Floating illegal operand

But if I do this with a floating array.
x=[0.,1.,2.,0.]
Then it works just fine
> X FLOAT = Array[4]
> NaN 1.00000 2.00000 NaN

I can see that other people have had troubles with this and explained it as a windows compiler errors, but I have a mac computer.
http://www.idlcoyote.com/math_tips/nans.html

Do anyone know if there is a solution for this?

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[Message index]

		NaN problem in integer arrays By: galaxytraveler42 on Thu, 17 October 2013 08:44
		Re: NaN problem in integer arrays By: David Fanning on Thu, 17 October 2013 08:50
		Re: NaN problem in integer arrays By: Kenneth Bowman on Thu, 17 October 2013 13:51

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