Histograms

It is possible to draw four types of histograms using the HISTOGRAMTYPE characteristic approach, or you can use the \HISTOGRAM qualifier to plot a histogram with tails to y=0 and profile along the x-axis.

Using the HISTOGRAMTYPE characteristic

The table below shows the histogram type that will be produced depending on the value of HISTOGRAMTYPE.

HISTOGRAMTYPE result
0(default value) line graph, not a histogram
1 histogram with no tails and profile along the x-axis
May control the width and colour individual bars
2 histogram with tails to y=0 and profile along the x-axis
May control the fill pattern, width, colour of each bar
3 histogram without tails and profile along the y-axis
May control the height and colour of each bar
4 histogram with tails to x=0 and profile along the y-axis
May control the fill pattern, height, colour of each bar

Using the \HISTOGRAM qualifier

The \HISTOGRAM qualifier is inconsistent when used in conjunction with the \AXESONLY qualifier.

Using the \HISTOGRAM qualifier is equivalent to using a HISTOGRAMTYPE setting of 2. A histogram with tails to y=0 and profile along the x-axis will be plotted. The following three commands:

 SET HISTOGRAMTYPE 2       ! force histogram plotting
 GRAPH X Y                 ! plot axes and histogram
 SET HISTOGRAMTYPE 0       ! reset to default value
 

are equivalent to the single command:

 GRAPH\HIST X Y

Filling

For information on how to fill the area under a histogram, see the AREAFILLCOLOR characteristic. For histograms with tails, types 2 and 4, it is possible to fill each histogram bar with a different color. For types 1 and 3, the area under a histogram can be filled with a single color.

For an example of various types of filled histograms see the histogram example.

  Replot data on a common scale
  Error bars