SAS/AF Software: Class Dictionary

Creating a Histogram Control

To create a Histogram control, open a frame and select a Histogram Control from the Components window. This instantiates the control for you. You can name the control by opening the Property sheet and assigning a name on the name attribute.

You can then perform the following tasks:

Before a graph is drawn, you must specify the data set and at least one variable. You can set other attributes before this is done, but no graph is drawn until the data set and variable are specified.

If you enter the data set and variable(s) through the Property sheet in build mode, the graph is displayed as soon as you enter the minimum information. If you use SCL to enter the information, the graph is displayed as soon as the minimum information is set and a Return statement is encountered. If you specify a data set or variable that does not exist, a warning is written to the SAS log, and no graph is drawn.

If build mode, using the Property sheet:

as soon as you enter the minimum information the XDataMin, YDataMin, ZDataMin, and XDataMax, YDataMax, ZDataMax attributes are filled in with the minimum and maximum values from the dataset. Also, if any of the variables were character data then the XVariableType, YVariableType, and ZVariableType values are set to Categorical and are no longer editable until you change the variable. This is because character data cannot be treated numerically
as you change attributes in the Property sheet, variable types do not change automatically every time. For example, if you assign a character variable to ZVariable, the variable type will change to Categorical. If you then assign a numerical variable to ZVariable, the variable type will still be categorical because it is valid to treat numerical data categorically.

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