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     The _pg_analyzechart functions analyze a single or multiple series
     of data without actually displaying the presentation-graphic
     image.
 
     The _pg_analyzechart function fills the chart environment with
     default values for a single-series bar, column, or line chart,
     depending on the type specified by the call to the
     _pg_defaultchart function.
 
     The variables calculated by _pg_analyzechart reflect the data
     given in the <categories> and <values> arguments. All arguments
     are identical to those for the _pg_chart function.
 
     The _pg_analyzechartms function fills the chart environment with
     default values for a multiseries bar, column, or line chart,
     depending on the type specified in the _pg_defaultchart function.
 
     The variables calculated by _pg_analyzechartms reflect the data
     given in the <categories> and <values> arguments. All arguments
     are identical to those for the _pg_chartms function.
 
     Boolean flags in the chart environment, such as AUTOSCALE and
     LEGEND, should be set to TRUE before calling either of the
     functions so that it will calculate all defaults.
 
     Return Value
 
     The _pg_analyzechart and _pg_analyzechartms functions return 0 if
     there were no errors. A nonzero value indicates a failure.
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