Jose Lykon's profile - activity

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2011-01-25 10:55:29 +0200	commented answer	Coercion problem while defining piecewise function That was very clear and informative. Thanks a bunch!
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2011-01-25 01:52:38 +0200	asked a question	Coercion problem while defining piecewise function In a nutshell: I begin by defining the following function: `def g(x): return math.exp(-1/(1 - x^2))` which poses no problem. Then, I try to use this function g to define a new function, as follows: `f = Piecewise([ [(-.5,.5), 0.44399*g(x)] ])` which returns the following error: --------------------------------------------------------------------------- TypeError Traceback (most recent call last) /Applications/sage/<ipython console> in <module>() /Applications/sage/<ipython console> in g(x) /Applications/sage/local/lib/python2.6/site-packages/sage/rings/fraction_field_element.so in sage.rings.fraction_field_element.FractionFieldElement.__float__ (sage/rings/fraction_field_element.c:8540)() /Applications/sage/local/lib/python2.6/site-packages/sage/rings/polynomial/polynomial_element.so in sage.rings.polynomial.polynomial_element.Polynomial.__float__ (sage/rings/polynomial/polynomial_element.c:8243)() TypeError: cannot coerce nonconstant polynomial to float ----------- I am not sure of what is going wrong here. Any ideas/solutions would be deeply appreciated. -jl