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Re: Strange results


From: Pascal J. Bourguignon
Subject: Re: Strange results
Date: Sat, 07 Sep 2013 14:34:12 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.2 (gnu/linux)

Dwaddle <address@hidden> writes:

> let didn't do the job, same results. But the problem is solved by explicit 
> setting the value to 0 or 1

Indeed, it's not only a problem of scope (with setq you modified global
dynamic variables, which is dangerous because it _may_ interfer with
other functions using the same variables.

But your problem was because you modified a literal object originally
built by the [0 0 0 0 0 0 0 0] expression.  But it is always the same
object that is modified every time you call the function.  Hence the use
of vector or make-vector, which create new vectors each time they're
evaluated.

-- 
__Pascal Bourguignon__
http://www.informatimago.com/


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