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From: | Ralf Hemmecke |
Subject: | Re: [Axiom-math] if-expression and variables |
Date: | Tue, 03 May 2011 11:21:12 +0200 |
User-agent: | Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.17) Gecko/20110414 Thunderbird/3.1.10 |
Dear Stefan,as others already have pointed out, for Axiom, your question is not really well posed.
In Axiom if x<10 then 2*x else 5*x^2is *not* an expression (as you might know it from other untyped CAS like Mathematica or Maple), but rather a programming language construct. In other words, if Axiom sees this, it is evaluated. So the result is either 2*x or 5*x^2 depending on the (boolean) outcome of the evaluation of x<10.
I think, Bill suggested to use something like InputForm. There it would be possible to represent an if-expression unevaluated.
But you should rather say what you actually want (it's not the same what you expect).
In order for us to suggest you a proper way to handle your use case, you should tell us why you want a piecewise function and (more important) what you later want to do with that function.
Until we have that information, everything would be just digging in the dark.
Ralf On 04/30/2011 08:40 PM, Stefan Karrmann wrote:
Dear all, I'm new to axiom and have a problem with piecewise functions. test1 (x | x< 10) == 2*x test1 (x | x< 10) == 5*x^2 test1 -> test1 (x | x< 10) == 2x test1 (x | ^ x< 10) == 5x Type: FunctionCalled test1 y -> 2 5y I expected something like (if y< 10 then 2*y else 5*y**2). How is it possible to pass a Variable to a piecewise function respecting the pieces? PS: Using a block and => or explicit if-then-else does not help.
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