' - - File: VII_FieldB2.txt

' Plot a "simple surface" directed field.

F{x,y} = y
G{x,y} =Cos[x]
H{x,y} = (x^2 - y^2) / 4

PlotDirField[F, G, H, {-3,3,15}{-3,3,15}]

' After the graph is displayed:
'     use the cursor keys to get a better angle of view;
'     Color the axes to see it relative to the image.

'     Use shift-A to increase the arrow head size.


