Thanks for the answer Andy, I found the problem and all is working...

Bill

On Wed, 6 Jun 2012 16:53:53 +0100
  andy pugh <[email protected]> wrote:
> On 6 June 2012 16:38, Cathrine Hribar <[email protected]> wrote:
> 
>> have run into a problem trying to do a loop.  when I use the sample in the
>> manual of the While/Do command, the computer goes into a constant loop, I
>> think.
> 
> If the WHILE condition never goes false, then the loop (and the
> preview) will run for ever.
> You can break the preview loop, I think it is ESC or CTRL-C. Though it
> might take some time to take effect.
> 
> Unfortunately the computer can't know whether your loop is valid. (
> http://en.wikipedia.org/wiki/Halting_problem ) so will just blindly
> loop for ever.
> 
> Have a look at your code and make sure that you are not using the loop
> condition variable for something else inside the loop, and that it
> reaches the termination condition. GT and LT are much less likely to
> cause problems than EQ. Even values which look the same to the
> displayed precision will fail the EQ test if they differ in the
> umpteenth decimal place.
> 
> -- 
> atp
> If you can't fix it, you don't own it.
> http://www.ifixit.com/Manifesto
> 
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