# comet3d

3D comet animated plot.

### Syntax

comet3d(z) comet3d(x, y, z) comet3d(x, y, fun) comet3d(x, y, z, p) comet3d(x, y, fun, p) comet3d(...,"colors", c)

### Parameters

- x
a real vector or matrix. If omitted, it is assumed to be the vector

`1:nz`

where`nz`

is the number of curve points given by the`z`

parameter.- y
a real vector or matrix. If omitted, it is assumed to be the vector

`1:nz`

where`nz`

is the number of curve points given by the`z`

parameter.- z
a real vector of length

`nz`

or a matrix with`nz`

rows.- p
a real scalar in the interval

`[0 1[`

. Default value is 0.1.- fun
a scilab function with syntax

`z=fun(x,y)`

.- c
a vector of

`ny`

color index.

### Description

If `(x,y,z)`

are three vectors with the same number of elements, this function draws a 3D comet
animated plot. The plot is made of three parts:

- ahead
mark that shows the current
`(x(i),y(i),z(i))`

position. - abody that shows the trailing curve that
follows the head: the
`(x(i-k:i),y(i-k:i),z(i-k:i))`

) part of the curve. - atail
that shows the
`(x(1:i-k),y(1:i-k),z(1:i-k))`

part of the curve.

if `z`

is a matrix and
`(x,y)`

are vectors then animated curves
are drawn for each triple `(x,y,z(:,l))`

.
in this case `nz`

is the number of rows of
`z`

.

if `x,y,z`

are matrices with the same dimensions then animated curves
are drawn for each triple `(x(:,l),y(:,l),z(:,l))`

.

`comet3d(x,y,fun,...)`

computes the
`z`

vector as
`z(i)=fun(x(i),y(i))`

`comet3d(...,p)`

can be used to set the
relative length of the body. `k`

is defined
as `k = round(p*nz)`

.

### Examples

### See also

- comet — 2D comet animated plot.

### History

Versão | Descrição |

5.3.2 | Function comet3d introduced |

## Comments

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