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pointer problems [message #66274]

Thu, 07 May 2009 11:55

tkg
Messages: 2
Registered: May 2009

Junior Member

I'm trying to store an array of pixel xy indicies for later output to
a text file. The number of xy pairs is different for each array
element. I'm trying to use pointers to do this with the following
code snippet:

xy = ptrarr(npixels, /ALLOC)

for ipixel = 0, npixels - 1 do begin

; much snipped code

indi = where(superMask ne 0, count)

if (count gt 0) then *xy[ipixel] = array_indices(superMask,
indi)

; more snipped code

endfor

npixels can range anywhere from fewer than 100 to 200+ and the xy
pairs can be a few pair up to a few hundred.

I find that afer a few iterations of the loop (actually ten iterations
with the test data i'm using). previously allocated heap pointers are
losing their values and become undefined. This would seem to indicate
memory allocation problems (the heap pointers are being overwritten by
some other portion of the code) , but I'm not sure how to go about
troubleshooting it or what I might do to avoid the overwrites. There
are no other pointers used anywhere else in the code.

If anyone has a clue as to what the problem might be or a suggestion
for a better way to do this, I'd appreciate the help.

Thanks.
Tom

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[Message index]

		pointer problems By: tkg on Thu, 07 May 2009 11:55
		Re: pointer problems By: R.G. Stockwell on Fri, 08 May 2009 11:20
		Re: pointer problems By: tkg on Fri, 08 May 2009 05:10
		Re: pointer problems By: R.G. Stockwell on Thu, 07 May 2009 20:02

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