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RangeNullCount - script and chart function

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RangeNullCount - script and chart function

RangeNullCount() finds the number of NULL values in the expression or field.

Syntax:  

RangeNullCount(first_expr [, Expression])

Return data type: integer

Arguments:  

The arguments of this function may contain inter-record functions which in themselves return a list of values.

Arguments
Argument Description
first_expr The expression or field containing the data to be measured.
Expression Optional expressions or fields containing the range of data to be measured.

Examples and results:  

Function examples
Examples Results
RangeNullCount (1,2,4)

Returns 0

RangeNullCount (5,'abc') Returns 0
RangeNullCount (null( ), null( ))

Returns 2

Example with expression:

RangeNullCount (Above(Sum(MyField),0,3))

Returns the number of NULL values in the three results of the Sum(MyField) function evaluated on the current row and two rows above the current row.

Information noteCopying MyField in example below will not result in NULL value.
Sample data
MyField RangeNullCount(Above(Sum(MyField),0,3))
10 Returns 2 because there are no rows above this row so 2 of the 3 values are missing (=NULL).
'abc' Returns 1 because there is only one row above the current row, so one of the three values is missing (=NULL).
8 Returns 0 because none of the three rows is a NULL value.

Data used in examples:

RangeTab:

LOAD * INLINE [

MyField

10

'abc'

8

] ;