On 06/03/2007 07:30 PM, Raymond E. Rogers wrote:
Ralf Hemmecke wrote:
Agreed, but what about telling Axiom the following:
(1) -> g(x)==if x>0 then x else -x
Type: Void
(
I am sorry for being a nuisance but I would like to point out:
This function can be expressed as
g(x)= -x +2*DD^2
Where DD is the second order of the Dirac Delta function; and DD^2 =
int(int(DD*1)) , a ramp starting at 0. The point is that piecewise
polynomials can be handled as generalized functions.
The integral int(g(x),a,b) would be [-(x^2/2)+DD^3]^b_a
I am retiring soon and perhaps will implement the useful parts of using
the Dirac Delta function in Axiom.
Ray Rogers
I don't know whether one can easily explain to a not so well trained
user what a "generalised function" is and that instead of
g(x)==if x>0 then x else -x
he/she should rather write
g(x)= -x +2*DD^2,
but I would love to see your contribution to Axiom. Hopefully you never
retire from using and contributing to Axiom.
All the best
Ralf
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