champ1¶

2D vector field plot with colored arrows

Calling Sequence¶

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

: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 graphics frame to use.
: :frameflag 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.
: :axesflag specifies how the axes are drawn. The associated value: should be an integer ranging from 0 to 5.
: :strf 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.

champ1(-5:5,-5:5,`rand`_(11,11),`rand`_(11,11),rect=[-10,-10,10,10],arfact=2)