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Negative values with incrementation
| Negative values with incrementation [message #70943] |
Thu, 20 May 2010 17:06 |
Suguru Amakubo
Messages: 24
Registered: March 2010
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Junior Member |
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Hi I am currently scattering points on a 400x400 image in order to use
them as reference points to manipulate subsets of images. During the
process I tried to establish the number of points scattered across the
image to see if any point is not covered by it.
When I was trying to evaluate the number of blank points on an image I
used incrementation to count the number of 'voids' in the scatter
pattern with a value of 0.
First time round, it gave me a positive number of void as expected and
I increased the number of points scattered however when I have done so
the number of void became negative.
below is the code:
void_point = 0
for count_x_axis = 0,size_of_image-1 do begin
for count_y_axis = 0,size_of_image-1 do begin
if coverage(count_x_axis,count_y_axis) eq 0 then void_point++
if void_point eq 0 then stop ; this test line was skipped and the
code stopped on the following stop
endfor
endfor
stop
coverage is a 400x400 matrice containing the number of reference
points scattered on a certain pixel.
and the output was:
IDL> print, void_point
-2469
the number of points scattered was 3015 (checked using help)
Any idea why this happens?
Thanks and apologies in advance if this is a trivial mistake.
Suguru
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