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Re: repeat.. until loops [message #16107 is a reply to message #15937]

Mon, 28 June 1999 00:00

Pavel Romashkin
Messages: 166
Registered: April 1999

Senior Member

Hi Craig,
In the code you sent "i" is not defined. If it is not defined earlier, then
indexing and assigning will fail. Also, why not use WHERE function since
you leave the "repeat" loop anyway once you located the pixel you want?
Good luck,
Pavel

Craig Aranjo wrote:

> 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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[Message index]

		repeat.. until loops By: Craig Aranjo on Sat, 26 June 1999 00:00
		Re: repeat.. until loops By: Pavel Romashkin on Mon, 28 June 1999 00:00

Previous Topic:	Crazy use of MAX function.
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