' - -File:  X_Field.txt

' Given (x,y) --> <F, H>, construct the directed field.
cx = .5
F{x,y} =1
H{x,y} = Sin[cx*(x^2 + y^2)]

a = -3  :  b = 3  :  n = 20
c = -3  :  d = 3  :  m = 20

PlotDirField[F, H, {a,b,n}{c,d,m}]







