# feather

Plot velocity vectors

## Syntax

```feather(U,V) feather(Z) feather(...,LineSpec) feather(axes_handle,...) h = feather(...) ```

## Description

A feather plot displays vectors emanating from equally spaced points along a horizontal axis. You express the vector components relative to the origin of the respective vector.

`feather(U,V)` displays the vectors specified by `U` and `V`, where `U` contains the x components as relative coordinates, and `V` contains the y components as relative coordinates.

`feather(Z)` displays the vectors specified by the complex numbers in `Z`. This is equivalent to `feather(real(Z),imag(Z))`.

`feather(...,LineSpec)` draws a feather plot using the line type, marker symbol, and color specified by `LineSpec`.

`feather(axes_handle,...)` plots into the axes with the handle `axes_handle` instead of into the current axes (`gca`).

`h = feather(...)` returns the handles to line objects in `h`.

## Examples

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Define `theta` as values between $-2\pi$ and $2\pi$. Define `r` as a vector the same size as `theta`.

```theta = -pi/2:pi/16:pi/2; r = 2*ones(size(theta));```

Create a feather plot showing the direction of `theta`. Since `feather` uses Cartesian coordinates, convert `theta` and `r` to Cartesian coordinates using `pol2cart`.

```[u,v] = pol2cart(theta,r); feather(u,v)```