CreateExpression()

Creates an expression field on a view.

expr = CreateExpression(string view_name, string expr_name, string expression, array options)

Argument	Contents
view_name	The view on which to create the expression field
expr_name	The name you want to use for the expression field
expression	An expression

Option	Type	Contents
Type	String	The data type of the expression field; supported types are "Integer", "Real" or "String"
Width	Integer	The display width
Decimals	Integer	The number of displayed decimals

A string that contains the actual name of the expression field.

The field type, display width,and number of displayed decimals are automatically determined if they are not specified in the options array.

pd_field_name = CreateExpression("U.S. States", "Pop Density", "Population/Area", )

Error Type	Meaning
Error	The expression is null or invalid; expr_name is null or invalid; or the expression field type is not specified and cannot be determined
NotFound	The specified view does not exist, or the input view_name is null and there is no current view

Function	Summary
VerifyExpression()	Verifies the validity of an expression
DestroyExpression()	Destroys an expression field
GetExpressions()	Returns an array of all expression fields defined in a view
GetExpressionInfo()	Returns information about an expression (formula) field
SetColumnArray()	Sets the columns displayed in an editor