I just fixed the bug which is in sympy\geometry\line3d.py:
def intersection(self, o):
...
elif isinstance(o, LinearEntity3D):
a = self.direction_cosine
b = o.direction_cosine
a = [abs(i) for i in a]
b = [abs(i) for i in b]
The qtconsole uses matplotlib to generate latex, which supports a more
limited set of latex (in particular, I don't think it supported
\begin).
Aaron Meurer
On Wed, Dec 3, 2014 at 4:35 PM, Alan Bromborsky wrote:
> I have custom latex printing working for galgebra in "ipython notebook", but
> it
newvars =symbols('x a b', integer=True)
e.xreplace(dict(zip([x,a,b], newvars)))
I did not test this.
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They need to be positive. Even for integer x, sqrt(x**2) != x if x is negative.
Aaron Meurer
On Fri, Dec 5, 2014 at 3:34 PM, Francesco Bonazzi
wrote:
> newvars =symbols('x a b', integer=True)
> e.xreplace(dict(zip([x,a,b], newvars)))
>
> I did not test this.
>
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You are heading into erroneous waters.
It doesn't matter that 3>0. sqrt(9) has two values, +3 and -3.
Just because some other systems make this mistake does not mean
sympy should do this.
If you want to say something about the choice of branch for sqrt(x^2),
you have to say something about sqrt(
Sorry I mistyped.
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