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Re: How to correct errors an IDL [message #82379 is a reply to message #82377]

Sat, 08 December 2012 00:57

Mats Löfdahl
Messages: 263
Registered: January 2012

Senior Member

Den lördagen den 8:e december 2012 kl. 09:24:38 UTC+1 skrev Dry in water:
> Hello all,
>
>
>
> when I imported an image with 4 bands into IDL using 'import image file' tool, but 'Program caused arithmetic error: Floating illegal operand' error appeared on command history window. So I imported this image using openr command.
>
>
>
> openr,1, 'D:\tmp\temp\temp_2000.tif'
>
> temper=fltarr(2894,4584,4)
>
> readu,1,temper
>
> close,1

I don't know anything about the "import image tool". Do you know that it supports tiff files?

Reading an image with openr and readu like you do works only if the file has no header. Surely tiff files start with at least some meta information? Did you display the images and do they look anything like you expect them to? If not, you may want to try using

temper = READ_TIFF ( Filename )

instead.

> Then I wanted to find out the indices of 'temper' that are not valid float-point numbers using finite command. But this command gave me just a number(-1). So I want to ask why finite command didn't show me all the location of not valid float-point numbers.
>
> Here is a command;
>
>
>
> print, where(~finite(temper))
>
> -1
>
> % Program caused arithmetic error: Floating underflow

If you get different results from reading the file in two different ways, there is a good chance at least one of those ways of reading is wrong.

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[Message index]

		Re: How to correct errors an IDL By: Dry in water on Sat, 08 December 2012 12:53
		Re: How to correct errors an IDL By: David Fanning on Sat, 08 December 2012 07:31
		Re: How to correct errors an IDL By: Dry in water on Sat, 08 December 2012 07:07
		Re: How to correct errors an IDL By: Mats Löfdahl on Sat, 08 December 2012 06:00
		Re: How to correct errors an IDL By: Mats Löfdahl on Sat, 08 December 2012 05:48
		Re: How to correct errors an IDL By: Helder Marchetto on Sat, 08 December 2012 05:44
		Re: How to correct errors an IDL By: Dry in water on Sat, 08 December 2012 04:12
		Re: How to correct errors an IDL By: Dry in water on Sat, 08 December 2012 02:55
		Re: How to correct errors an IDL By: Mats Löfdahl on Sat, 08 December 2012 00:57

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