Hello,
I've just tried to produce randomized fractions. I've decided to use
randint but I've noticed a wierd behavior shown in the following code with
one output.
Best regards.
Christophe
= PYTHON CODE =
for i in range(1, 6):
a_Num = (-1)^randint(1, 2)*randint(1, 20)
a_Den = rand
You don't actually say what you find weird about your output, so I had
to look at it for a while before coming up with something. I'm
guessing it's how the division is behaving?
`randint` returns a Python int:
sage: randint(1, 10)
7
sage: type(randint(1, 10))
And division of Python ints is tru
Hello,
you're right my example is too long. Here is a better example where you can
see that the use of ``1*randint(-20, 20)`` instead of ``randint(-20,
20)`` will produce fractions instead of integer divisisons.
I really think that this is illogical. Don't you ?
Christophe.
= Python-Sage
I guess that here there are some Sage-type conversions coming from ``+/-
1*...``.
>From my point of view, using in Sage, ``randint`` should produce Sage
integers and not Python integer.
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> I really think that this is illogical. Don't you ?
No, because it's perfectly consistent.
I can see why it's not obvious, though -- and for related reasons, in
Python 3 the division of two ints produces a float (or in Python 2 if
you `from __future__ import division`). That won't help us much
On 09/19/2012 07:23 PM, Christophe BAL wrote:
Hello,
you're right my example is too long. Here is a better example where you
can see that the use of ``1*randint(-20, 20)`` instead of
``randint(-20, 20)`` will produce fractions instead of integer
divisisons.
I really think that this is illogi
What I think very confusing is that 1/4 is the Sage division and not the
Python standard one, so why it would be different for randint ?
I'm a teacher and the problem is not from my point of view but it will be a
tricky thing to explain to my students which are in "french lycée" (sorry,
I don't kn
On Wed, Sep 19, 2012 at 12:42 PM, Christophe BAL wrote:
> What I think very confusing is that 1/4 is the Sage division and not the
> Python standard one, so why it would be different for randint ?
It's not Sage division vs. Python division, it's Sage Integers vs. Python ints.
At the Sage console
I agree that this is a surprising and unfortunate wart in the was Sage
is built. I would explain it like this:
Python has an integer type int that has several surprising behaviors
(from a mathematicians perspective, e.g. division). For this reason we
created our own time, Integer, that behaves bet
sorry for the late answer.
After some investigations on the internet, I did not find any convenient
solution.
My concern being on polynomials, I ended up doing some copy/paste of my
expressions and working in another window with a polynomial ring defined
the following way :
R. = QQ[]
R. = Polyn
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