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Re: set all elements in 2d array between some range to 1 [message #91085 is a reply to message #91028]

Tue, 02 June 2015 20:37

havok2063
Messages: 24
Registered: December 2012

Junior Member

Hi Jeremy,

Thanks a lot for your help. This is great. Exactly the solution I'm looking for. Hmm..my original loop is taking me ~30 seconds. Not sure why yours is much faster. Here is my code. Actually it seems it's because the 10.^loglam is being done every loop iteration. Changing this to a stored variable, the loop takes 2.1 seconds.

starttime = systime(/seconds)
for j=0,nlines-1 do begin
index=where((10.^loglam gt skylines[j].skywave-skypad)and(10.^loglam lt skylines[j].skywave+skypad),nindex)
f (nindex gt 0) then skylinemask[index]=1
endfor
print, (systime(/seconds)-starttime)
30.812672

I really like your code, since it's faster and no loops. However, when I run it, I'm getting some small differences between the output from the original vs the new method.

IDL> help, where(skylinemask)
<Expression> LONG = Array[226935]

IDL> help, where(skylinemask_v2)
<Expression> LONG = Array[226933]

IDL> help, where(skylinemask ne skylinemask_v2)
<Expression> LONG = Array[14]

Printing these 14 elements for both the old and new mask shows that are flipped from each other. Could it be a boundary issue?

Cheers, Brian

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[Message index]

		set all elements in 2d array between some range to 1 By: havok2063 on Fri, 22 May 2015 14:14
		Re: set all elements in 2d array between some range to 1 By: David Fanning on Fri, 22 May 2015 14:22
		Re: set all elements in 2d array between some range to 1 By: havok2063 on Fri, 22 May 2015 14:58
		Re: set all elements in 2d array between some range to 1 By: David Fanning on Fri, 22 May 2015 16:25
		Re: set all elements in 2d array between some range to 1 By: Jeremy Bailin on Tue, 26 May 2015 20:46
		Re: set all elements in 2d array between some range to 1 By: Jeremy Bailin on Tue, 26 May 2015 21:05
		Re: set all elements in 2d array between some range to 1 By: Jeremy Bailin on Tue, 26 May 2015 21:12
		Re: set all elements in 2d array between some range to 1 By: havok2063 on Tue, 02 June 2015 20:37
		Re: set all elements in 2d array between some range to 1 By: Jeremy Bailin on Wed, 03 June 2015 12:31
		Re: set all elements in 2d array between some range to 1 By: havok2063 on Mon, 08 June 2015 15:03

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