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champ(2) Scilab Function champ(2)
NAME
champ - draw a 2d vector field
CALLING SEQUENCE
champ(x,y,fx,fy [,arfact,rect,strf])
champ1(x,y,fx,fy [,arfact,rect,strf])
PARAMETERS
x,y : two vectors which define the grid.
fx : a matrix which describes the x component of the vector field.
fx(i,j) is the x component of the vector field at point
(x(i),y(j)).
fy : a matrix which describes the y component of the vector field.
fy(i,j) is the y component of the vector field at point
(x(i),y(j)).
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)
rect : a vector rect=[xmin,ymin,xmax,ymax] which gives the boundaries
of the graphic frame to use.
strf : is a string of length 3 "xyz" which has the same meaning as the
strf parameter of plot2d. The parameter "x" has no effect with
champ.
DESCRIPTION
champ draws a 2d vector field. If ones uses champ the length of the arrows
are proportional to the field intensity and if one uses champ1 (with a
color screen) the color of the arrow depends on the intensity of the field.
Enter the command champ() to see a demo.
EXAMPLE
// 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");
AUTHOR
J.Ph.C.
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