hp40g+.book Page 20 Friday, December 9, 2005 1:03 AM
N O T E This operation supposes that the current variable is also the variable of the function or curve you want to graph. When the expression is copied, it is evaluated, and the current variable (contained in VX) is changed to X, T, or θ, depending on the type of plot you chose.
If the function depends on a parameter, it is preferable to
give the parameter a value before pressing 
. If, however, you want the parameterized expression to be copied with its parameter, then the name of the parameter must consist of a single letter other than X, T, or θ, so that there is no confusion. If the highlighted expression has real values, the Function, Aplet or Polar Aplet can be chosen, and the graph will be of Function or Polar type. If the highlighted expression has complex values, the Parametric Aplet must be chosen, and the graph will be of Parametric type.
To summarize. If you choose:
•the Function Aplet, the highlighted expression is copied into the chosen function Fi, and the current variable is changed to X.
•the Parametric Aplet, the real part and the imaginary part of the highlighted expression are copied into the chosen functions Xi,Yi, and the current variable is changed to T.
•the Polar Aplet, the highlighted expression is copied
into the chosen function Ri and the current variable is changed to θ.
NUM key | Pressing | in the Equation Writer causes the |
| highlighted expression to be replaced by a numeric | |
| approximation. | puts the calculator into |
| approximate mode. | |
SHIFT NUM key Pressing 
in the Equation Writer causes the highlighted expression to be replaced by a rational
number. 
puts the calculator into exact mode.
VIEWS key | Pressing | in the Equation Writer enables you to | |||
| move the cursor with the | and | arrow keys to see | ||
| the entire highlighted expression. Press | to return in | |||
| the Equation Writer. |
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