$POS

The integer function $POS is used to determine the position number in a set from the index or element name. Suppose that COM is the set (c1-c5) and that MARCOM is the set (c3,c4) which has been declared as a subset of COM. Then:

$POS(c3,COM) = 3

$POS(c3,MARCOM) = 1

The first argument of $POS can also be an index. Thus

Formula (all,c,COM) X(c) = $POS(c,COM) ;

puts X(c1) equal to 1, X(c2) = 2, X(c3) = 3, X(c4) = 4 and X(c5) = 5.

In the above formula, we could omit the second $POS argument, since c is already running over COM. That is, we could write:

Formula (all,c,COM) X(c) = $POS(c) ;

with identical results.

$POS must be sure to find the sought element somewhere in the target set. Hence TABLO disallows the following formula:

Formula (all,c,COM) X(c) = $POS(c,MARCOM);

since COM is not a subset of MARCOM

The example below shows how we can make a new set, COM, by inserting a new element, "PipeLine" into an existing set COM0. The new element is inserted just after the existing "RailTransprt" element.

Set

PART1 = (all,c,COM0:$pos(c)<=$pos("RailTransprt",COM0));

PART2 = COM0 - PART1;

COM = PART1 + "PipeLine" + PART2;

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URL of this topic: www.copsmodels.com/webhelp/tabmate/hc_pos.htm

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