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Plots may be generated and displayed using the "Input Function" pane of the 
"Plot" subform. The first plot to be created and displayed causes the graphics 
workspace to be created. 
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More than one plot may be displayed in the same window;  each time the
user fills in the "Function" parameter and clicks on "Plot Function",
the new plot will be added to the graphics workspace.  
Plots may be hidden using the "HIDE" action button on the guide pane of the 
main Xprism2 form, or deleted using the "DELETE" action button.  Until the 
graphics workspace is destroyed using the "CLEAR" action button, each new plot 
will continue to be added to the existing graphics workspace.
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Each plot that is created will be displayed according to the plot type that 
was selected on the "Input Function" pane.  Thus, by changing
the plot type before each new plot is displayed, any of the five plot types 
may be displayed simultaneously in the graphics workspace.
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Twenty (20) plots may be displayed in a workspace; however, for readability,
five (5) is the recommended limit.  If one has access to a color workstation,
it is much easier to distinguish plots from each other than if one is
working on a monochrome workstation. 
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The following list describes the options available on the "Input Function"
pane.
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Function
.IP 
The user will specify the function to plot.
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X Range
.IP 
The user will specify the function minimum, maximum and number of data
points
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Points to Be Displayed
.IP 
The option labeled "Points to be Displayed" allows the user to window on 
a specified portion of the data. In addition to windowing, the user may also 
subsample the data to be displayed. All data is read in when
the "Plot File" button is clicked with the mouse; the "Points to be Displayed"
option works on that data. Once plotted, the window and subsampling parameters 
may be changed for each currently displayed plot using the "Attributes" 
subform. The "Points to be Displayed" option has three items that can be 
changed. The following explains these options:
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.IP "Step Size"
This "Step Size" option specifies how the data should be subsampled
between the begin point and the end point. The default value is 1; ie, every
point is used.
.IP "Begin Point"
The "Begin Point" specifies the first of the data points to plot. That is,
which data point to begin with, the data points being numbered sequentially. 
For example, if the "Begin Point" is specified as 5, the plot will start with
the fifth data point.  If the "Begin Point" is set to 0 (the default value), 
then the "end point" is ignored and all data points are used.
.IP "End Point"
The "End Point" specifies the last of the data points to plot. That is,
which data point to end with, the data points being numbered sequentially.
For example, if the "End Point" is specified as 25, the plot will end with the
twenty-fifth data point. If the "End Point" is set to 0 (the default value), 
then the last data point in the file is used as the end point.
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Plot Type
.IP 
Each plot that is input will be displayed as the plot type that is indicated
by the "plot type" toggle in the "Input File" pane.  Thus, by changing
the plot type before each new plot is displayed, any of the five plot types
may be displayed simultaneously in the graphics workspace.
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See the associated HELP for valid functions and ploting functions.
