Page 12-10
Note
: When you press
J
, your variables list will show new variables
called
@@@X@@
and
@@Y1@@
. Press
‚
@@Y1@@
to see the contents of this
variable. You will get the program <<
→
X ‘LN(X)’ >> , which you will
recognize as the program that may result from defining the function ‘Y1(X) =
LN(X)’ by using
„à
. This is basically what happens when you
@@ADD@!
a
function in the PLOT – FUNCTION window (the window that results from
pressing
ñ
, simultaneously if in RPN mode), i.e., the function gets
defined and added to your variable list.
Next, press
‚
@@@X@@@
to see the contents of this variable. A value of 10.275 is
placed in the stack. This value is determined by our selection for the
horizontal display range. We selected a range between -1 and 10 for X. To
produce the graph, the calculator generates values between the range limits
using a constant increment, and storing the values generated, one at a time,
in the variable
@@@X@@@
as the graph is drawn. For the horizontal range ( –1,10),
the increment used seems to be 0.275. When the value of X becomes larger
than the maximum value in the range (in this case, when X = 10.275), the
drawing of the graph stops. The last value of X for the graphic under
consideration is kept in variable X. Delete X and Y1 before continuing.
Graph of the exponential function
First, load the function
exp(X),
by pressing, simultaneously if in RPN mode, the
left-shift key
„
and the
ñ
(
V
) key to access the PLOT-FUNCTION
window. Press
@@DEL@@
to remove the function LN(X), if you didn’t delete Y1 as
suggested in the previous note. Press
@@ADD@!
and type
„¸~x`
to
enter EXP(X) and return to the PLOT-FUNCTION window. Press
L
@@@OK@@@
to
return to normal calculator display.
Next, press, simultaneously if in RPN mode, the left-shift key
„
and the
ò
(
B
) key to produce the PLOT WINDOW - FUNCTION window.
Change the H-View values to read: H-View: -8 2
by using
8\
@@@OK@@ @
2
@@@OK@@@
. Next, press
@AUTO
. After the vertical range
is calculated, press
@ERASE @DRAW
to plot the exponential function.
