UD MAX - Unsave Document - get Max/Min from document column

PURPOSE

To find maximum and minimum from specified column of a document file. Useful to find the highest value in a selection file.

SEE ALSO

UD N	[Unsave Document - get key Numbers]

USAGE

.OPERATION: UD MAX [maxval],[minval]

[Where:
[maxval] is an optional register variable to be filled with maximum value.
[minval] is an optional register to be filled with minumum value.

.DOCUMENT FILE: DOC555
[Enter the name of an existing document file. Can be an incore doc. file.]

REGISTER COLUMN TO BE SEARCHED (0 = KEY) [Can search key column (0) or any of the register columns in the document file. Values will be reported in Results file.]

NOTES

1. Operation may be slow on large doc. files.

SUBROUTINES

RDDOCN, OPENDOC, LUNDOC

CALLER

DRIV3