# pseg()

Here’s how to use pseg() function.

A.pseg(x,y)

Description

Return the sequence number of the interval in which the parameter falls.

Syntax

A.pseg(x,y)

Note

The function returns the sequence number of the interval in which y falls in sequence A, which must be an ordered one. By default the sequence members form intervals that are left-closed and right-open. Parameter x is an expression which will be calculated over each member of sequence A.

In the cases where y is not a member of A, if y is less than the smallest member of an increasing sequence A (or y is greater than the largest member of a decreasing sequence A), then return 0; if y is greater than or equal to the largest member of an increasing sequence A (or y is less than or equal to the smallest member of a decreasing sequence A), then return the length of A.

Parameters

 A A sequence x An expression, which is a field name or a legal expression made up of field name and in which the sign ~ can be used to reference the current record; can be absent y An expression

Options:

@r  Form intervals that are left-open and right-closed

Return value

The sequence number of the interval to which y belongs

Example

 A 1 [2,22,122,222,2222] 2 =A1.pseg(12) 1. The intervals formed by members of the sequence are [2,22), [22,122), [122,222), [222,2222) and [2222,∞) 3 =A1.pseg(2222) 5 4 =A1.pseg@r(2222) 4 5 [1,4,8] 6 =A5.(~+~).pseg(10) 2 7 =A5.pseg(~+~,10) 2; the expression is equivalent to A6’ s expression 8 =A1.pseg(1) 0