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Re: Array into binary array [message #86539 is a reply to message #86538]

Mon, 18 November 2013 00:18

Helder Marchetto
Messages: 520
Registered: November 2011

Senior Member

On Monday, November 18, 2013 8:51:09 AM UTC+1, Oliver Angelil wrote:
> I have an array:
>
>
>
> A =MAKE_ARRAY(4000, 120, 60, 3, /FLOAT, VALUE =!VALUES.F_NaN)
>
>
>
> 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.
>
>
>
> Perhaps there is a quick solution which I have not found yet?
>
>
>
> Thanks in advance,
>
>
>
> Oliver

Hi Oliver,
how about using the FINITE() function (http://www.exelisvis.com/docs/FINITE.html).

IDL> PRINT, FINITE(ALOG(FINDGEN(10)-5.0))
0 0 0 0 0 0 1 1 1 1
IDL> help, FINITE(ALOG(FINDGEN(10)-5.0))
<Expression> BYTE = Array[10]
IDL> PRINT, ALOG(FINDGEN(10)-5.0)
-NaN -NaN -NaN -NaN -NaN -Inf 0.000000 0.693147 1.09861 1.38629

You might then use WHERE to locate the NaN or finite value accordingly.

So, in your case I would use something like this (free to modify):

B = BYTARR(4000, 120, 60, 3)
FiniteVals = WHERE(FINITE(A), Count)
IF Count GT 0 THEN B[FiniteVals] = 1B

Finite will find both NaNs and Inf. Use the appropriate keywords of Finite if you wish to select only one of the two.

Hope it helps.

Regards,
Helder

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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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