Problem with minuses in tensor library's ex_calc.mac

Thanks for that Viktor.  Hopefully you'll be hearing from me again before the 
next release - for my research (in Kaluza-Klein reduction) I'm currently making 
a mac package to work with abstract differential forms off the back of your 
itensor package.  It's coming together quite nicely so far and should hopefully 
be working in time for 5.15...  Any questions or feature requests (not that I 
guarantee to be able to answer them!), let me know!

Happy Christmas all.

       Josie

Quoting "Viktor T. Toth" <vttoth at vttoth.com>:

> 
> Thank you for those fixes! I have incorporated them into the CVS version,
> and I am not observing any ill effects either.
> 
> Unfortunately, I don't think it is possible to include your fix in the
> 5.14.0 release; we are too late for that. I think that's okay, since the
> code fails gracefully, in that it prints a valid error message, as opposed
> to producing an incorrect result.
> 
> 
> Viktor
> 
> 
> 
> -----Original Message-----
> From: maxima-bounces at math.utexas.edu [mailto:maxima-bounces at math.utexas.edu]
> On Behalf Of josie.huddleston at durham.ac.uk
> Sent: Saturday, December 22, 2007 7:35 PM
> To: maxima at math.utexas.edu
> Subject: Problem with minuses in tensor library's ex_calc.mac
> 
> I've come across an issue that'll hopefully fix fairly easily: the functions
> 
> covind and contind in ex_calc.mac (in the tensor share library) both get
> thrown 
> by things with a minus operator.  I've had a quick look, and I reckon it'll
> fix 
> the problem if you add the following lines:
> 
> Between lines 110 and 111:
> else if op(t)="-" then covind(part(t,1))
> 
> Between lines 93 and 94:
> else if op(t)="-" then contind(part(t,1))
> 
> I've added these changes on my copy, with no apparent ill effects so far...
> 
> The problem doesn't show up in ex_calc.dem, I think because some of the
> terms 
> in all these examples are positive so it just ignores the anomalous result
> of 
> the negative ones somehow.
> 
> Is it too late to get this changed for the new version?  Fingers crossed...!
> 
> 
>                Josie
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