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How to locate a "NaN"? [message #56267]

Mon, 08 October 2007 23:12

mystea
Messages: 16
Registered: October 2007

Junior Member

Hello All,

I have a array of length 100. A significant portion of them is
recorded as NaN. Now I want to figure out what is the largest index of
the element that contains a valid number, then assign its value to
these NaN entries.

I thought it would be easy and tried:

IDL> k=max(where(myarray[*] ne !VALUES.D_NAN))

but it does not work! k equals to 99 in this case. what's really
strange is the following:

IDL> help, myarray[50]
<Expression> DOUBLE = NaN

IDL>print, (myarray[50] eq !VALUES.D_NAN)
0
(so I think this means myarray[50] is double, is NAN, yet is not !
VALUES.D_NAN)

In short, the problem is, how to locate array elements whose values
are NaN?

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