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Re: repeat.. until loops [message #15935 is a reply to message #15934]

Sun, 27 June 1999 00:00

Craig Aranjo
Messages: 3
Registered: June 1999

Junior Member

Perhaps i didbn't explain this properly:

half_col = col_max / 2

I wanto to move radially inwards from left to right half way down the binary
image until i find a white pixel. Unfortuantely, the repeat...until loop
does not terminate after it has found the white pixel... it continues until
it exceeds the row max value and propagtes an error. I would like it to
return the value i of the white pixel.

Any help with the code below

Thanks

Craig

Craig Aranjo <aranjo@currantbun.com> wrote in message
news:3774fe7b.0@news1...
>
> Why does this not work in IDL??
>
> repeat begin
> if img(i, half_col) ge 245 then row_start = i $
> else i = i + 1
> endrep $
> until img(i, half_col) ge 245
>
>
> I am looking at a binary image for the first white pixel halfway down the
> image (moving inwards).
> It always gives me an error that exceeds the maximum row valuie of the
> image.
>
>
> Any ideas.... I'm sure this is a really silly question.
>
>

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		Re: repeat.. until loops By: Craig Aranjo on Sun, 27 June 1999 00:00
		Re: repeat.. until loops By: Craig Aranjo on Sun, 27 June 1999 00:00

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