"Chris Rebert" <c...@rebertia.com> wrote in message
news:y2o50697b2c1004091304u627d99bfj44ad56fa76a3c...@mail.gmail.com...
On Fri, Apr 9, 2010 at 11:43 AM, John Nagle <na...@animats.com> wrote:
Chris Rebert wrote:
On Fri, Apr 9, 2010 at 8:04 AM, Peyman Askari
<peter_peyman_...@yahoo.ca>
wrote:
Hello
This is partly Python related, although it might end up being more math
related.
I am using PyGTK (GUI builder for Python) and I need to find the
intersection point for two lines. It is easy to do, even if you only
have
the four points describing line segments
(http://www.maths.abdn.ac.uk/~igc/tch/eg1006/notes/node23.html).
However, it
requires that you solve for two equations. How can I do this in Python,
either solve equations, or calculating intersection points some other
way?
Just solve the equations ahead of time by using generic ones.
<snip>
x = (c - b) / (m-n)
Actually, you don't want to do it that way, because it fails for vertical
lines, when m and n go to infinity.
As the programmer said upon seeing a stripe-less zebra:
"Oh no, a special case!"
Excellent catch my good sir; although I will point out that strictly
speaking, you can't put vertical lines into slope-intercept form (but
I should not have forgotten that precondition).
And parallel lines, where m and n are equal (divide-by-zero)...
-Mark
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