Carlos Córdoba wrote:
> Thanks for your quick answers. Coming from Mathematica, I was expecting to
> add lists as vectors, multiply real numbers by lists, etc, without
> sub-classing or using another types (such as vectors in sage)
>
> Do you advise me to add things to the preparser to have this behaviour or
> not? If so, how can I do it?
>
You might get some of the functionality you want by using numpy arrays.
sage: import numpy
sage: a0 = numpy.array([1,2,3,4])
sage: a0
array([1, 2, 3, 4], dtype=object)
sage: a1 = numpy.array([5,6,7,8])
sage: a0+a1
array([6, 8, 10, 12], dtype=object)
sage: a0*2.5
array([2.50000000000000, 5.00000000000000, 7.50000000000000,
10.0000000000000], dtype=object)
sage:
a0*a1
array([5, 12, 21, 32], dtype=object)
numpy and sage don't cooperate perfectly at the moment, as numpy does
not accept sage's native types. But, there are workarounds:
http://wiki.sagemath.org/faq#Typeissuesusingscipy.2CcvxoptornumpyfromSage
This situation may be resolved in sage-4.1.1, assuming a recently
developed patch survives the referee process.
--
Kevin Horton
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