On 04/29/2013 10:53 PM, Chris Smith wrote:
When you give a dictionary the keys are unordered and to be canonical,
the keys are sorted.
What sort of expression are you wanting to do what type of
substitution on? Maybe replace, xreplace or Transform are better
matches for what you want to do.
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I am trying to speed up my code (geometric algebra). Instead of
precalculating various multiplication tables (there are four types of
multiplication *,^,|,<,>) and connections
(for dealing with manifolds when needed) I would like to do the
calculations on the basis multivectors (for an n-dimensional vector
space there are 2**n bases so each multiplication
table has 2**(2n) entries, and there are n*2**n connections, n for each
basis multivector) only when they are needed for a particular operation
and save the results for when they
are needed for future operations (in the same code, not for future
runs). Thus the idea of a dictionary that only adds entries that can
be calculated from functions when they
are needed and not before.
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