On Mar 17, 10:40 am, "Guan Guofeng" <ggp...@gmail.com> wrote:
> that's not the key
> import numpy
> x=numpy.arange(0,1,.05)
> y=numpy.sin(x)
> still can't work

Ahh right. NumPy is not compatible with the Sage number types. Either
specify "%python" at the top of the cell, or do

sage: import numpy
sage: Integer = int
sage: RealNumber = float
sage: x = numpy.arange(0, 1, .05)
sage: y = numpy.sin(x + 2*numpy.pi)

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