HP HP-28S - Page 91

Purge any existing PPAR.
~ PPflR .1 PURGE 1
Select Radians angle mode and STD number display mode .
• 1 MODE 1 - STO If~ I
IiiDIilIIIEDlKaDBImIltI
Now enter the expression.
~ I TRIG 1 SIN X 1 ENTER 1
3:
2:
1: 'SIN(X)'
I!mIImmaa~1IllCII1lI1lCI
Store the expression as the current equation-a normal variable with
the special name EQ. (This is the same convention you followed with
the Solver in chapter 4.)
.1 PLOT 1 STEQ
Pressing STEQ is equivalent to pressing ~ EQ 1 STO I.
Plot the expression.
DRAW
Wait for the «e») annunciator to disappear, indicating that the plot is
complete.
The horizontal line is the axis for the independent variable (x in this
example),
and the vertical line is the axis for the dependent variable
(the value
of the expression sin x). The ticks on both axes mark inter-
vals
of length 1.
90 7: Plotting