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Re: transfer the specific data in array A to array B [message #88248 is a reply to message #88247]

Wed, 02 April 2014 11:52

Andy Sayer
Messages: 127
Registered: February 2009

Senior Member

Ah, ninjad by Craig. :)

On Wednesday, April 2, 2014 2:51:00 PM UTC-4, AMS wrote:
> Yes, you have to define the array B before you can attempt to fill its elements like that.
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> There are other ways you could code something like the above, although if you're a beginner then try first however makes sense to you. :) For example, this should work:
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> ndata=n_elements(a)
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> for_b=where(a[1:ndata-2]-a[0:ndata-1] gt 80,nvals)
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> if nvals gt 0 then b=a[for_b]
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> And in case you need it, nvals in the above is the same as the final value of j.
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> Hope this helps,
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> Andy
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> On Wednesday, April 2, 2014 2:37:55 PM UTC-4, lczha...@gmail.com wrote:
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>> I got a question when I was trying to save the interested data from array A to a NEW array B.
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>> j=0
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>> FOR i=0,n-2 do begin
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>> IF A[i+1]-A[i] gt 80 THEN BEGIN
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>> B[j]=A[i]
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>> j=j+1
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>> ENDIF
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>> ENDFOR
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>> it seems theres something wrong with B[j]=A[i] should I define B as an array first? Or anyone has a better idea? I know it is a stupid question....sorry about that

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[Message index]

		transfer the specific data in array A to array B By: lczhang123 on Wed, 02 April 2014 11:37
		Re: transfer the specific data in array A to array B By: Craig Markwardt on Wed, 02 April 2014 11:46
		Re: transfer the specific data in array A to array B By: Andy Sayer on Wed, 02 April 2014 11:51
		Re: transfer the specific data in array A to array B By: Andy Sayer on Wed, 02 April 2014 11:52
		Re: transfer the specific data in array A to array B By: Andy Sayer on Wed, 02 April 2014 13:57

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