DOC MIRROR - Mirror a Document file

PURPOSE

Create second document file that lacks values found in a specified column in the first document file.. All values are converted to integers so this operation is only useful for columns containing integer values!   Example.

SEE ALSO

SD	[Save Document]
DOC CREATE	[Create Document file]
DOC MERGE	[Merge two Document files]
DOC SHUFFLE	[Shuffle Document file]
DOC AND	["And" two Document files]
DOC SUBTRACT	[Subtract two Document files]

USAGE

.OPERATION: DOC MIRROR

.INPUT DOCUMENT FILE: DOC001
[Enter name of input document file.]

.COLUMN TO BE MIRRORED (0 IS KEY): 1
[Enter column number which will be mirrored. If the key column (0) is chosen the new document file will contain only those keys not found in the current file and column one of the new file will be filled with 1's. If a colunn other than the key column is specified then the new file will have consecutive keys in the key column and the specified column will be filled with values not found in the specified column of the input file. Any previous columns will be filled with 0's. ]

.OUTPUT DOCUMENT FILE: DOC002
[Enter name of output document file.]

SUBROUTINES

DOCS1, OPENDOC, SAVDN1, LUNDOC

CALLER

DRIV1