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Re: Problems using the image function

From: Ted Harding
Subject: Re: Problems using the image function
Date: Wed, 26 Jul 1995 09:28:41 +0200 (BST)

( Re Message From: Michael Martins )
> Ich have problems to use the image and imagesave function. The command 
> sequence:
>       octave:1> a = [1 2; 3 4];
>       octave:2> image(a);
> gives the following error message:
>       warning: save: no such variable `image.1307.img'
>       octtopnm: unable to open input file

This is a minor bug in "saveimage.m". Here is the answer to a similar
recent query:

I think you have fallen foul of a typo in the file


as follows

          # Save image in octave image file format

          # The following line is buggy
          # eval (['save -asciii ', oct_file, ' map X']);
            eval (['save -ascii ', oct_file, ' map X']);

where oct_file is a string which is intended to be a filename of the form
"image.xxxx.img", where "xxxx" is four random digits. Because the flag
"-ascii" is mis-spelt, the save command executed is
          save -asciii image.xxxx.img map X
which tries to save variables 'image.xxxx.img', 'map' and 'X' to the file
'-asciii'. Hence the result.  If you make the correction given above, it
should work. (By the way, delete the file '-asciii' in your directory.)

Ted.                                    (address@hidden)

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