pyevspace 0.0.11

A Euclidean vector space module.

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PyEVSpace

PyEVSpace is a Python Euclidean Vector Space package containing Euclidean vector and matrix types. The types are desigend to be used to represent physical vectors and rotations between reference frames, which means they are all 3-dimensional. This means that operations don't require size checking at runtime, which allows for optimum performance. The package only allows 3-dimensional vectors and matrices, so if you need something different, you should use a package more suited to your needs, such as numpy.

Install

The python module can be installed with

pip install pyevspace

Alternatively the repository can be downloaded or cloned using:

git clone https://github.com/qbizzle68/pyevspace.git

It can be used as is within Visual Studio, or built using setup.py if needed.

Usage

To use the module simply import the pyevspace module into your project:

from pyevspace import *

# create vector
vec = EVector((1, 2, 3))

# create matrix from sequences
mat = EMatrix((1, 3, 2), (7, 4, 3), (8, 4, 2))

# rotate vector
rotated = mat * vec

The module only contains two types, and a handful of module level methods, so it is probably necessary to import everything. However, if you don't wish to overpopulate the namespace, you can import the module using an alias:

import pyevspace as evs

vec = evs.EVector()

Examples

Examples of numeric operators

v1 = EVector((1, 2, 3))
v2 = EVector((4, 5, 6))

print(v1 * 2)
# prints [2, 4, 6]

print(v1 + v2)
# prints [5, 7, 9]

print(v1 - v2)
# prints [-3, -3, -3]

Examples of vector and matrix operators

v1 = EVector((1, 2, 3))
v2 = EVector((4, 5, 6))
m1 = EMatrix( EVector(4, 2, 3), EVector(8, 5, 2), EVector(4, 2, 1) )

print(dot(v1, v2))
# prints 32.0

print(cross(v1, v2))
# prints [ -3.00000, 6.00000, -3.00000 ]

print(det(m1))
# prints -8.0

print(transpose(m1))
# prints 
# ([4, 2, 3],
# [8, 5, 2],
# [4, 2, 1])

Methods and operators

EVector operators:

• + addition (other EVector)
• += inplace addition (other EVector)
• - subtraction (other EVector)
• -= inplace subtraction (other EVector)
• * multiplication (floats or ints)
• *= inplace multiplication (floats or ints)
• / division (floats or ints)
• /= inplace division (floats or ints)

EVector methods:

• mag() magnitude of a vector
• mag2() square of the magnitude of a vector
• normalize() normalizes a vector
• copy() creates a deep copy of the vector
• [0] gets the first comonent of a vector
• [1] = 4 sets the second comonent of a vector to 4

EMatrix operators:

• + addition (other EMatrix)
• += inplace addition (other EMatrix)
• - subtraction (other EMatrix)
• -= inplace subtraction (other EMatrix)
• * multiplication (floats or ints or other EVector or other EMatrix)
• *= inplace multiplication (floats or ints)
• / division (floats or ints)
• /= inplace division (floats or ints)

EMatrix methods:

• [1, 1] gets a component of a matrix
• [0, 2] = 4 sets a component of a matrix to a value

module level methods:

• dot(EVector, EVector) vector dot product
• cross(EVector, EVector) vector cross product
• norm(EVector) returns a normalized vector
• vang(EVector, EVector) computes the angle between two vectors
• vxcl(EVector, EVector) computes a vector exculded from another
• det(EMatrix) computes the determinate of a matrix
• transpose(EMatrix) computes the transpose of a matrix

License

MIT