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.TH champ 2 "April 1993" "Scilab Group" "Scilab Function"
.so ../sci.an
.SH NAME
champ - draw a 2d vector field
.SH CALLING SEQUENCE
.nf
champ(x,y,fx,fy [,arfact,rect,strf])
champ1(x,y,fx,fy [,arfact,rect,strf])
.fi
.SH PARAMETERS
.TP 10
x,y
: two vectors which define the grid.
.TP
fx
: a matrix which describes the x component of the vector field. \fVfx(i,j)\fR
is the x component of the vector field at point \fV(x(i),y(j))\fR.
.TP
fy
: a matrix which describes the y component of the vector field. \fVfy(i,j)\fR
is the y component of the vector field at point \fV(x(i),y(j))\fR.
.TP
arfact
: an optional argument of type real which gives a scale factor for the display of the arrow heads on the plot (default value is 1.0)
.TP
rect
: a vector rect=[xmin,ymin,xmax,ymax] which gives the boundaries of the
graphic frame to use.
.TP
strf
: is a string of length 3 "xyz" which has the same meaning as the strf
parameter of \fVplot2d\fR. The parameter "x" has no effect with \fVchamp\fR.
.SH DESCRIPTION
\fVchamp\fR draws a 2d vector field. If ones uses \fVchamp\fR the length
of the arrows are proportional to the field intensity and if
one uses \fVchamp1\fR (with a color screen) the color of the
arrow depends on the intensity of the field.
Enter the command \fVchamp()\fR to see a demo.
.SH EXAMPLE
.nf
// using rect has graphic boundaries
champ(-5:5,-5:5,rand(11,11),rand(11,11),1,[-10,-10,10,10],"011");
xgrid();
xbasc();
// using (x,y) to get boundaries
champ(-5:5,-5:5,rand(11,11),rand(11,11),2,[-10,-10,10,10],"021");
// using coloured arrows
xset("use color",1)
champ1(-5:5,-5:5,rand(11,11),rand(11,11),2,[-10,-10,10,10],"021");
.fi
.SH AUTHOR
J.Ph.C.
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