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# xarrows

draw a set of arrows

### Calling Sequence

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

### Arguments

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

- arsize
real scalar, size of the arrow head. The default value can be obtained by setting arsize to -1.

- style
matrix or scalar. If

`style`

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`style(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 ith 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`

.

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