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Re: Array into binary array [message #86540 is a reply to message #86538]

Mon, 18 November 2013 00:57

lecacheux.alain
Messages: 325
Registered: January 2008

Senior Member

Le lundi 18 novembre 2013 08:51:09 UTC+1, Oliver Angelil a écrit :
> I have an array:
>
>
>
> A =MAKE_ARRAY(4000, 120, 60, 3, /FLOAT, VALUE =!VALUES.F_NaN)
>
>
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> It consists of numbers between 0 and 1 as well as NaN values. I want to make a binary array from this, such that when an element is NaN, it'll be 0 in the binary array, and when it is a number between 0 and 1, it'll be 1 in the binary array.
>
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> Perhaps there is a quick solution which I have not found yet?
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> Thanks in advance,
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>
>
> Oliver

This is the purpose of the FINITE function. From IDL documentation:

"Returns 1 (True) if its argument is finite. If the argument is infinite or not a defined number (NaN), the FINITE function returns 0 (False). The result is a byte expression of the same structure as the argument X."

Then, you can simply write:
IDL> A =MAKE_ARRAY(4000, 120, 60, 3, /FLOAT, VALUE =!VALUES.F_NaN)
... populate A ...
IDL> B = Finite(A)
use B ...

alx.

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[Message index]

		Array into binary array By: Oliver Angelil on Sun, 17 November 2013 23:51
		Re: Array into binary array By: Helder Marchetto on Mon, 18 November 2013 00:18
		Re: Array into binary array By: lecacheux.alain on Mon, 18 November 2013 00:57
		Re: Array into binary array By: Oliver Angelil on Mon, 18 November 2013 01:08

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