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HP 9G Calculator - Using the Graphing Features

Generating a graph
The HP 9G calculator can display graphs of built-in functions as well as single variable functions.
Built-in function graphs
Graphs can be produced of the following functions:
sin
cos
tan
sin-1
cos-1
tan-1
sinh
cosh
tanh
sinh-1
cosh-1
tanh-1
x2
x3
log
ln
10x
ex
x-1
When generating a built-in graph, any previously generated graph is cleared. The display range is automatically set to the optimum.
Custom graphs
Graphs can be generated from your own single-variable functions (for example, y = x3 + 3x2- 6x - 8). When creating custom graphs, the display range must be set.
Press the Range key to access the range parameters for each axis for each value:
  • Minimum value.
  • Maximum value.
  • Scale (the distance between the marks along an axis). (See Figure 1)
Figure : Range values
After setting the range, press Graph and then enter the expression to be graphed.
See Figure 2 for an example of creating a custom graph.
Figure : Creating a custom graph
Working with graphs
This section explains the functions that can be used when working with graphs.
Using graph / text display
To switch between the graph display and the text display, press the GT key.
Clearing a graph
To clear the graph, press 2nd, then CLS. The graph will be cleared, and only the axis lines will displayed.
Zooming
The zoom function is used to enlarge or reduce the graph.
  • To enlarge the graph, press 2nd, Zoom ( f, and specify the enlargement factor.
  • To reduce the graph, press 2nd, Zoom ( 1/f, and specify the reduction factor.
  • To return the graph to the original size, press 2nd, then Zoom Org.
Superimposing graphs
A graph can be superimposed over one or more other graphs in order to determine intersection points and solutions that satisfy all the corresponding expressions. (See Figure 3.)
Be sure to input variable X in the expression for any graph that will be superimposed over a built-in graph. If variable X is not included in the second expression, the first graph is cleared before the second graph is generated. (See Figure 4.)
Figure : Superimposing graphs
Figure : Superimposing with a built-in graph
Tracing
With the trace function, a pointer is moved around a graph by using the Right and Left Arrow keys ( and ). The x- and y-coordinates of the current pointer location are displayed on the screen. This function is useful for determining the intersection of superimposed graphs (by pressing 2nd, the XY).
  note:
Due to the limited resolution of the display, the position of the pointer may be an approximation.
Scrolling
A graph can be scrolled on the display by using the arrow keys to move to the left or right, or up or down.
Plotting and using the line function
The plot function is used to mark a point on the screen of a graph display. The point can be moved left, right, up, or down using the cursor keys. The coordinates of the point are displayed.
  1. Move the pointer to the desired location.
  2. Press 2nd, then PLOT to plot a point.
  3. The point blinks at the plotted location.
Two points can be connected with a straight line by pressing 2nd, then LINE.

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