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overloading times operator
*To*: mathgroup at smc.vnet.net
*Subject*: [mg88820] overloading times operator
*From*: gstaples <gstaceystaples at yahoo.com>
*Date*: Sat, 17 May 2008 05:32:08 -0400 (EDT)
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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