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2011-04-09 20:00:05 +0100 | answered a question | Composite function h(t) = f(*g(t)) |
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2011-04-08 12:08:42 +0100 | marked best answer | Cast to Expression Yeah, that tripped me up too! You can do it by calling the parent ring, which in this case is the Symbolic Ring, abbreviated SR: |
2011-04-08 12:06:36 +0100 | commented answer | Variable type returned after integrating. That makes sense. Thank you. |
2011-04-08 12:02:33 +0100 | asked a question | Cast to Expression How do I cast a number to an Expression? I would have assumed: |
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2011-04-08 11:51:24 +0100 | marked best answer | Variable type returned after integrating. The problem with the Piecewise functions was reported in trac #10841 and a fix has been accepted and is pending for sage 4.7. It basically only adds four characters to cast the integrand to an Expression. If there are other functions which don't behave, could you report them to trac? Integration does gives different type results depending on the ranges (e.g. for definite integrals you can easily get Integers, Rationals, RealDoubleElements, and so on.) You can work around this easily enough on the "outside" in your own code by explicitly casting to SR, but I admit it's sometimes hard to work around problems on the "inside", i.e. in built-in functions. |
2011-04-08 00:17:29 +0100 | asked a question | Variable type returned after integrating. If I have an expression and I integrate it, the type of object that is returned is not constant. This makes it quite hard to write functions that do things with Expressions. Is there some trick I'm missing to get around this? An example of where this causes a problem: |