I am using sage-4.0.rc0 on 32 bit ubuntu 8.10.
I have discovered a very strange interaction between the "Integer=int"
declaration, division, and the number of times a worksheet is evaluated.
Consider the following worksheet. The very first time it is
evaluated, division is handled as float division, and the results are
what I hoped for. But, if I evaluate the cell again, I get a
different answer. This time the division seems to be python integer
division, and I get a different result. I keep getting this second
result until I restart the worksheet, then I get the first result for
a single evaluation.
Regardless of what the correct behaviour is, I would hope to get the
same behaviour every time I evaluate the worksheet. This looks like a
bug to me.
================================
First evaluation after restarting worksheet:
Division Error?
system:sage
{{{id=2|
Integer=int
print float(500/1000), float(1000/1000)
print float(500/1000.), float(1000/1000.)
///
0.5 1.0
0.5 1.0
}}}
================================
Second and subsequent evaluation:
Division Error?
system:sage
{{{id=2|
Integer=int
print float(500/1000), float(1000/1000)
print float(500/1000.), float(1000/1000.)
///
0.0 1.0
0.5 1.0
}}}
Note: I am using the RealNumber=float; Integer=int declarations to
avoid errors when specifying axis parametres for matplotlib plots. I
may need to start wrapping each of those parametres in float() instead.
--
Kevin Horton
Ottawa, Canada
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