Hello,
On Wed, Jan 28, 2009 at 11:56 PM, martin Campos Pinto
<mcp.st...@gmail.com> wrote:
>
> Hi everybody,
>
> in my Notebook (version 3.2.3) I get the following:
>
> sage: a = float(1>1)
> sage: a
>
> 0.0
>
> sage: var('x')
> sage: b(x) = float(x>1)
When you make a definition like this, float is immediately applied to
x>1. Since x is a symbolic variable, it cannot be determined whether
or not that inequality is true or false. To delay the evaluation of
float until a value is plugged in for x, you can do something like the
following:
sage: b = lambda x: float(x>1)
sage: b(2)
1.0
sage: b(-1)
0.0
--Mike
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