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Aide de Scilab >> Graphiques > 2d_plot > champ1


2D vector field plot with colored arrows


champ1(x, y, fx, fy, [arfact, rect, strf])


x, y

two vectors which define the grid.


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)).


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)).


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).


a vector rect = [xmin, ymin, xmax, ymax] which gives the boundaries of the graphics frame to use.


controls the computation of the actual coordinate ranges from the minimal requested values. The associated value should be an integer ranging from 0 to 8.


specifies how the axes are drawn. The associated value should be an integer ranging from 0 to 5.


a string of length 3 "xyz" which has the same meaning as the strf parameter of plot2d. The first character x has no effect with champ1.


champ1 draws a 2D vector field with colored arrows. The color of the arrows depends on the intensity of the field.

If you want arrows proportional to the intensity of the field, use champ.

Enter the command champ1() to see a demo.

Be cautioned about the fact that using meshgrid function before using champ1 requires adjustment. For more details, see the last example below.


// using meshgrid to get fx and fy
x = linspace(-1,1,30);
y = linspace(-1,1,30);
[X,Y] = meshgrid(x,y);
fy = 2.*Y;
fx = 2.*X;
champ1(x,y,fx',fy'); //here we have transposed fx and fy

See also

  • champ — 2D vector field plot
  • fchamp — direction field of a 2D first order ODE
  • plot2d — 2D plot
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Last updated:
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