- The
buttons under the graph allow various manipulations of
the graph coordinates.
- The text input fields for
*f* (*x*,*y*) and
*g*(*x*,*y*) can accept
a wide variety of expressions
to represent functions.
- The text input fields for
*x*_{0} and
*y*_{0} can accept real numbers
in decimal notation.
- The value for
*t*_{max} (the maximum value for
the parameter *t*) can be changed by entering a new value directly
into the text input field marked "t_{max}=".
- The text input field for
*t*_{max} can accept a real number
in decimal notation.
- The "Field" button displays a window
which allows manipulations of the vectors shown
in green on the graph:
- The values in the
"del
_{x}=" and
"del_{y}=" fields in the window
determine the *x* and *y*
spacing (respectively) of the grid points at which the vectors are plotted.
- The value in the
"scale=" field determines a scaling factor by which
the vectors can be reduced or extended.
- Standard values (set by the
"Std" button in the window) are
del
_{x}=1.0, del_{y}=1.0,
and *scale*=0.1 (these are also the default values set by the
"Clear" button).
- These text input fields can accept any real number in decimal notation.

©2002, Addison-Wesley. All rights reserved.