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Re: regarding scope of variables [message #46510 is a reply to message #46509]

Fri, 25 November 2005 20:42

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

IDLmastertobe writes:

> Hi, I have an array of data and I am trying to keep a copy of it so that i
> can restore the origianl data after certain operations. however I found
> everytime it reiterates the function, the variable that keeps the copy
> would go out of scope and my copy is gone. following is part of my code:
>
> if(size(ydata, /n_dimensions) eq 3) then begin
> if(!firsty eq 1) then begin
> yarr = ydata
> !firsty=0
> endif
> ydata = smooth(yarr, [1, !smo, !smo])
> oyimage->SetProperty, data = ydata
> endif
>
> however, the second time when this code is called, the yarr variable
> becomes undefined since it goes out of scope. What it copied in the first
> time is gone. Since I have no information on the size of the array i'm
> copying, i cannot preset an array as system variable to run. Does anyone
> have any idea?

I have a hunch "variable scope" is not your real problem here.
I already see two more system variables in these few lines of
code than I've ever used in an IDL procedure. :-)

Is the real problem that you can't figure out how to pass around
data in a widget program? Have you thought about using pointers?

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: regarding scope of variables By: R.Bauer on Sun, 27 November 2005 01:09
		Re: regarding scope of variables By: David Fanning on Sat, 26 November 2005 06:51
		Re: regarding scope of variables By: IDLmastertobe on Sat, 26 November 2005 01:19
		Re: regarding scope of variables By: David Fanning on Fri, 25 November 2005 20:42

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