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# xarrows

draw a set of arrows

### Calling Sequence

xarrows(nx, ny, [arsize, color])

### Arguments

- nx, ny
real vectors or matrices of same size.

- arsize
a real scalar, size of the arrow head. The default value can be obtained by setting

`arsize`

to`-1`

.- color
a matrix or scalar. If

`color`

is a positive scalar it gives the color to use for all arrows. If it is a negative scalar then the current color is used. If it is a vector`color(i)`

gives the color to use for arrow`i`

.

### Description

`xarrows`

draws a set of arrows
given by `nx`

and `ny`

.
If `nx`

and `ny`

are vectors,
the `i`

-th arrow is defined by
`(nx(i),ny(i))-->(nx(i+1),ny(i+1))`

.
If `nx`

and `ny`

are matrices:

nx=[xi_1 x1_2 ...; xf_1 xf_2 ...] ny=[yi_1 y1_2 ...; yf_1 yf_2 ...]

the `k`

-th arrow is defined by `(xi_k,yi_k)-->(xf_k,yf_k)`

.

`xarrows`

uses the current graphics
scale which can be set by calling a high level
drawing function such as `plot2d`

.

## Comments

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