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Some useful PLOT operations for FUNCTION plots
In order to discuss these PLOT options, we'll modify the function to force it to
have some real roots (Since the current curve is totally contained above the x
axis, it has no real roots.)
X 'EXP(-X^2/2)/ √(2*π) ' >>.
Y1 on the stack: <<
→
use:
˜
‚˜
ššš-0.1
`
Next, store the modified expression into variable y by using „@@@Y1@@ if in
RPN mode, or „îK @@@Y1@@ in ALG mode.
The function to be plotted is now,
Enter the PLOT WINDOW environment by entering „ò(press them
simultaneously if in RPN mode.)
press ˜@AUTO to generate the V-VIEW. To plot the graph, press @ERASE @DRAW
•
Once the graph is plotted, press @) @ FCN! to access the function menu.
With this menu you can obtain additional information about the plot
such as intersects with the x-axis, roots, slopes of the tangent line,
area under the curve, etc.
•
For example, to find the root on the left side of the curve, move the
cursor near that point, and press @ROOT. You will get the result: ROOT:
-1.6635.... Press L to recover the menu.
ROOT in the current plot:
Press ‚@@@Y1@@ to list the contents of the function
Launches the line editor
Moves cursor to the end of the line
Modifies the expression
Returns to calculator display
1
f
(
x
)
=
exp(
2
π
Keep the range of –4 to 4 for H-VIEW,
To edit this expression
2
x
−
)
−
0
1 .
2
Here is the result of
Page 12-5
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