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CHAPTER 4
4. Parametric Graphing
The parameter graph mode can display graphs of defined equations (X = X(t), Y = Y(t))
using three parameters (variables). To display the calculated points, the calculator
increases the T interval of Tstep and executes calculation. When the parameter
coordinates are set, press
to input T. You may draw up to 2 graphs in parameter
graph.
<Example>
Graph “X = 3 sin T - 2”, “Y = 2 cos T”.
1. Set parametric coordinates.
Press Ï
E 2.
2. Input equations.
Press
key to display screen to the right.
Input “3 sin T - 2” to “X1T” and “2 cos T” to “Y1T”.
Press 3 s
- 2 ® 2 c
®.
* To change the graph size, reset the WINDOW value (see
page 104) or execute ZOOM (see page 100).
3. Plot graph.
Press to plot graph.
* In the CALC functions of the parametric coordinate system,
only Value (numeric value) is valid. Other functions, such as
Intsct, Minimum, etc., used in the rectangular coordinate system are not provided.
* All trigonometric functions within a function equation are calculated using the angle unit (Deg,
Rad or Grad) specified in the SET UP menu. Set angle unit system according to use.
EL-9650-(04)En (079-134) 8/7/00, 9:07 PM92
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