' - - File: VII_FieldB3.txt

' Plot a "simple surface" directed field.

F{x,y} = x
G{x,y} =y
H{x,y} =2* Sin[x + y] + 1

PlotDirField[F, G, H, {-3,6,30}{-3,6,30}]

' 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.

'     Click on the box option; color the axes to see it.



