Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #38952 > unrolled thread

python math problem

Back to article view | Back to comp.lang.python

Contents

  python math problem Kene Meniru <Kene.Meniru@illom.org> - 2013-02-15 14:39 -0500
    Re: python math problem John Machin <sjmachin@lexicon.net> - 2013-02-15 18:51 -0800

#38952 — python math problem

I am trying to calculate the coordinates at the end of a line. The length 
and angle of the line are given and I am using the following formula:

x = (math.sin(math.radians(angle)) * length)
y = (math.cos(math.radians(angle)) * length)

The following are sample answers in the format (x, y) to the given 
length/angle values of the line:

120/0  = (0.0, 25.0)
120/89 = (24.9961923789, 0.436310160932)
120/90 = (25.0, 1.53075794228e-15)
120/91 = (24.9961923789, -0.436310160932)

Why am I getting a string number instead of the expected answer  for 120/90 
which should be (25.0, 0.0). This happens at all multiples of 90 (i.e. 180 
and 270)

-- 

Kene
::::::::::::::::::
KeMeniru@gmail.com

[toc] | [next] | [standalone]

#38984

On Feb 16, 6:39 am, Kene Meniru <Kene.Men...@illom.org> wrote:

> x = (math.sin(math.radians(angle)) * length)
> y = (math.cos(math.radians(angle)) * length)

A suggestion about coding style:

from math import sin, cos, radians # etc etc
x = sin(radians(angle)) * length
y = cos(radians(angle)) * length

... easier to write, easier to read.

[toc] | [prev] | [standalone]

Back to top | Article view | comp.lang.python

csiph-web