- Variable names in text input fields:
type "t" for
,
and type "s" for 
.
- Variable names in labels:
"r" represents
,
"t" represents ,
and "s" represents
(so, for example, "tmin" gives the minimum value for
)
-- see "How To Use".
Also, the value 
=3.14159... is represented
as "Pi."
- The
buttons under the graph allow various manipulations of
the graph coordinates.
- The text input fields for functions
can accept
a wide variety of expressions to represent functions.
- There are four input fields which specify
bounds on the variables for the functions:
- The variable
(the first angle, measured counterclockwise
in the xy-plane)
takes values between
min
and
max,
with min and
max
specified by the fields marked
"tmin=" and
"tmax=".
Note that the value in each text input field is multiplied by
=3.14159...
- The variable
(the second angle, measured down from
the z-axis)
takes values between
min
and
max,
with
min
and
max
specified by the fields marked
"smin=" and
"smax=".
Note that the value in each text input field is multiplied by
=3.14159...
These four text input fields can accept any decimal number input.
The same bounds apply to all functions.
- For another way to view surfaces, try the
"wireframe" representation.
©2002, Addison-Wesley. All rights reserved.