Enter a function f_{1}(x,y)
in the text input field
marked "f_{1}(x,y)="
(Example:f_{1}(x,y)=
5-x^{2}-y^{2})
Click the "Graph" button
(this button also refreshes the graph)
Rotate the graph by
clicking and dragging the mouse on the graph.
To see two functions graphed simultaneously:
Enter the second function
f_{2}(x,y) in the text input field
marked "f_{2}(x,y)="
Click (to its "on" state) the check box next
to this input field
Click the "Graph" button
(Example:f_{1}(x,y)=
5-x^{2}-y^{2}
and
f_{2}(x,y)=1-x-y)
Up to 3 functions can be graphed simultaneously
To remove a function from the graph, click (to its "off" state)
the check box next to the associated text input field and click
the "Graph" button to refresh
To erase the graph and all input fields, click the
"Clear" button
Other Notes
Surfaces in three dimensions are represented in
"faceted hidden surface" form. The facets are not subdivided at intersections
of surfaces if more than one surface is drawn, so intersections
of surfaces are not precise. The
"wireframe" representation for surfaces,
in which the surface is transparent,
only draws one surface at a time.