On 2009-04-01 19:12, Terry Reedy wrote:
olusina eric wrote:
I hope somebody will be able to help me here.
I am trying to solve some physical problems that will require the
generation of some function in terms of some parameters. These
functions are derived from matrix operation on “characters”. Are there
ways numpy/scipy perform matrix operations on characters?
For example A = matrix([[a, b,c],[d,e,f],[1,2,3]])
B = matrix([[g,h,4],[I,j,5],[k,l,6]])
A to l are identifiers, not characters, and must be bound to objects for
the above to make any sense. Did you mean 'a' to 'l'?
Is it possible to perform operations like A*B or A+B
And most especially: linalg.solve(A,eye(3,3))
If you mean, operate on symbols to do symbolic computation, the same way
one might with paper and pencil, the simple answer is no. Numpy is not a
computer algebra system.
Computer algebra requires that one define classes such as Symbol, with
all the usual arithmetic operations. I am not sure whether numpy
algorithms can work on arrays of instances of user-defined classes such
as this.
They can't.
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco
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