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Re: overloading times operator
*To*: mathgroup at smc.vnet.net
*Subject*: [mg88830] Re: overloading times operator
*From*: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
*Date*: Sat, 17 May 2008 23:29:12 -0400 (EDT)
*References*: <g0m918$3n$1@smc.vnet.net>
Hi,
it's frustrating to repeat, that we can only answer a question when
we get the full code and *not* a mixture of Mathematica and TeX
and not a description like
"wrote a procedure to define the non-commutative product"
because the problem is probably in that "procedure to define the
non-commutative product" and we can't help you if you don't
write how this "procedure to define the non-commutative product"
is defined.
Regards
Jens
gstaples wrote:
> I wrote a procedure to define the non-commutative product of two elements of the form e_X e_Y, where X and Y are multi-indices. I do this using Times.
>
> I do a simple calculation like
>
> Expand[(e_{1} + e_{3})(e_{1} - e_{3})]
>
> and get the wrong answer. (On the first try.)
>
> If I then re-execute the code that defines the multiplication, I repeat the calculation and get correct output.
>
> Alternatively, if I execute
>
> e=Symbol["e"]
>
> before loading the procedure, I get correct output on the first try.
>
> More troubling is that after getting correct output, if I perform calculations of a different kind (e.g. matrix multiplication), when I repeat my original calculation, I start getting incorrect output again. (Until I re-execute the code that defines the multiplication.)
>
> It's frustrating to repeat a calculation and get different sets of output depending on what other calculations are done in between.
>
> Does anyone have suggestions?
>
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