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Please note that the recommended version of Scilab is 6.0.2. This page might be outdated.
See the recommended documentation of this function

comet

2D comet animated plot.

Syntax

comet(y)
comet(x,y)
comet(x,fun)
comet(x,y,p)
comet(x,fun,p)
comet(...,"colors",c)

Parameters

x

a real vector or matrix. If omitted, it is assumed to be the vector 1:ny where ny is the number of curve points (see below).

y

a real vector or matrix of length.

p

a real scalar in the interval[0 1[. Default value is 0.1.

fun

a scilab function with syntax y=fun(x). fun can also be a polynomial or a rational fraction.

c

a vector of ny color index.

Description

If (x,y) are two vectors with the same number of elements, this function draws a 2D comet animated plot showing the progression of the curve (x(1:k),y(1:k)) for k varying from 1 to size(x,'*').

The plot is made of three parts:

mark that shows the current (x(i),y(i)) position.

a body

that shows the trailing curve that follows the head: the (x(i-k:i),y(i-k:i)) part of the curve.

a tail

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

comet(x,fun,...) is equivalent to comet(x,feval(x,fun),...).

comet(...,p) can be used to set the relative length of the body. k is defined as k = round(p*ny).

If y is a matrix then animated curves are drawn for each pair (x,y(:,l)). In this case ny is the number of rows of y.

If x and y are matrices with identical sizes then animated curves are drawn for each pair (x(:,l),y(:,l)). In this case ny is the number of rows of x and y.

comet(...,"colors",c) can be used to set the colors of each curves.

Examples

t = linspace(0,10*%pi,500);
clf();
isoview; //set isoview axes
comet(t.*sin(t), t.*cos(t))
t = linspace(0,10*%pi,500)';
clf();
comet(t.*sin(t), [t.*sin(2*t) t.*sin(3*t)])
t = linspace(0,10*%pi,500)';
clf();comet(t.*sin(t),[t.*sin(2*t) t.*sin(3*t)],"colors",[3 5])
function y=traj(x)
y=1.5*sin(x^2)
endfunction
clf();
comet(linspace(0,5,500),traj)
clf();
comet(linspace(-2,4,500), (%s-3)/(%s^3+2*%s^2+1))

• color — Retorna o identificador de uma cor
• comet3d — 3D comet animated plot.
• paramfplot2d — Esboço animado 2d, curva definida por uma função

History

 Version Description 5.3.2 Function comet introduced.