HP 50G, User Manual

Page: 402 / 887

Page 12-19
We will try to plot the function f(
θ
) = 2(1-sin(
θ
)), as follows:
Θ
First, make sure that your calculator’s angle measure is set to radians.
Θ
Press
„ô
, simultaneously if in RPN mode, to access to the PLOT
SETUP window.
Θ
Change
TYPE
to
Polar
, by pressing
@CHOOS ˜ @@@OK@@@
.
Θ
Press
˜
and type:
³2* „ Ü1-S~‚t @@@OK@@@
.
Θ
The cursor is now in the
Indep
field. Press
³~‚t @@@OK@@@
to
change the independent variable to
θ
.
Θ
Press
L @@@OK@@@
to return to normal calculator display.
Θ
Press
„ò
, simultaneously if in RPN mode, to access the PLOT
window (in this case it will be called PLOT –POLAR window).
Θ
Change the H-VIEW range to –8 to 8, by using
8\ @@@OK@@@ 8 @@@OK@@@
, and the V-VIEW range to -6 to 2 by using
6\ @@@OK@@@ 2 @@@OK@@@
.
Θ
Change the
Indep Low
value to 0, and the High value to 6.28 (
≈
2
π
), by
using:
0 @@@OK@@@ 6.28 @@@OK@@@
.
Θ
Press
@ERASE @DRAW
to plot the function in polar coordinates. The result is a
curve shaped like a hearth. This curve is known as a cardiod (
cardios
,
Greek for heart).
Θ
Press
@EDIT L @LABEL @MENU
to see the graph with labels. Press
L
to
recover the menu. Press
L @)PICT
to recover the original graphics menu.
Θ
Press
@TRACE @x,y@
to trace the curve. The data shown at the bottom of the
display is the angle
θ
and the radius r, although the latter is labeled Y
(default name of dependent variable).
Note : the H-VIEW and V-VIEW determine the scales of the display
window only, and their ranges are not related to the range of values of
the independent variable in this case.