# Difference between revisions of "Change Of Coordinate Transformations"

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Change of Coordinate Transformations
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Change of Coordinate Transformations

Image displaying different coordinate systems.

# Basic Description

A Change Of Coordinate Transformation is a transformation that converts coordinates from one coordinate system to another coordinate system. Transformations such as scaling, rotating, and translating are usually looked upon as changing or manipulating the geometry itself. However, with change of coordinate transformations, it is important to realize that the coordinate representation of the geometry is modified, rather than the geometry itself.

# A More Mathematical Explanation

Note: understanding of this explanation requires: *Linear Algebra

Change of coordinate transformations are different for vectors and points. Choose from one of the se [...]

Change of coordinate transformations are different for vectors and points. Choose from one of the sections below to get a better understanding of how the transformations are applied.

### Vectors

Consider a coordinate system A, and a vector $\boldsymbol{\vec{p}}$. The coordinates of $\boldsymbol{\vec{p}}$ relative to coordinate system A is $\boldsymbol{\vec{p}}_A = (x, y)$. It is also apparent that
$\boldsymbol{\vec{p}} = x\boldsymbol{\hat{u}} + y\boldsymbol{\hat{v}}$
In which $\boldsymbol{\hat{u}}$ and $\boldsymbol{\hat{v}}$ are unit vectors along the x and y-axes of coordinate system A. Now consider a second coordinate system, B. In coordinate system B,
$\boldsymbol{\vec{p}}_B = x\boldsymbol{\hat{u}}_B + y\boldsymbol{\hat{v}}_B$
More generally, given $\boldsymbol{\vec{p}}_A = (x, y)$ along with $\boldsymbol{\hat{u}}$ and $\boldsymbol{\hat{v}}$, $\boldsymbol{\vec{p}}_B = (x', y')$ may be found using the formula above.
In 3-dimensional space, given $\boldsymbol{\vec{p}}_A = (x, y, z)$ then
$\boldsymbol{\vec{p}}_B = x\boldsymbol{\hat{u}}_B + y\boldsymbol{\hat{v}}_B + z\boldsymbol{\hat{w}}_B$
In which $\boldsymbol{\hat{u}}$, $\boldsymbol{\hat{v}}$, and $\boldsymbol{\hat{w}}$ are unit vectors along the x, y, and z-axes of coordinate system A.

### Points

Consider a coordinate system A, and a point $\boldsymbol{q}$. Point $\boldsymbol{q}$ may be expressed as:
$\boldsymbol{q} = x\boldsymbol{\hat{u}} + y\boldsymbol{\hat{v}} + \boldsymbol{O}$
In which $\boldsymbol{\hat{u}}$ and $\boldsymbol{\hat{v}}$ are unit vectors along the x and y-axes of coordinate system A, and $\boldsymbol{O}$ is the origin of coordinate system A. Now consider a second coordinate system, B. In coordinate system B,
$\boldsymbol{q}_B = x\boldsymbol{\hat{u}}_B + y\boldsymbol{\hat{v}}_B + \boldsymbol{O}_B$
More generally, given $\boldsymbol{q}_A = (x, y)$ and $\boldsymbol{\hat{u}}$, $\boldsymbol{\hat{v}}$, and $\boldsymbol{O}$ relative to coordinate system B, then $\boldsymbol{q}_B = (x', y')$ may be found using the above formula.

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