HP 49g+, User Manual

Page: 402 / 862

Page 12-25
•
Press
@ERASE @DRAW
to draw the parametric plot.
•
Press
@EDIT L @LABEL @MENU
to see the graph with labels. The window
parameters are such that you only see half of the labels in the x-axis.
•
Press
L
to recover the menu. Press
L @)PICT
to recover the original
graphics menu.
•
Press
TRACE @
(
X,Y
)
@
to determine coordinates of any point on the graph.
Use
™
and
š
to move the cursor about the curve. At the bottom of the
screen you will see the value of the parameter t and coordinates of the
cursor as (X,Y).
•
Press
L @CANCL
to return to the PLOT WINDOW environment. Then,
press
$
, or
L @@@OK@@@
, to return to normal calculator display.
A review of your soft menu key labels shows that you now have the following
variables: t, EQ, PPAR, Y, X, g,
θ
0, V0, Y0, X0. Variables t, EQ, and PPAR
are generated by the calculator to store the current values of the parameter, t,
of the equation to be plotted EQ (which contains ‘X(t) + I
∗
Y(t)’), and the plot
parameters. The other variables contain the values of constants used in the
definitions of X(t) and Y(t).
You can store different values in the variables and produce new parametric
plots of the projectile equations used in this example. If you want to erase the
current picture contents before producing a new plot, you need to access
either the PLOT, PLOT WINDOW, or PLOT SETUP screens, by pressing,
„ñ
,
„ò
, or
„ô
(the two keys must be pressed simultaneously