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## Manuals

### difmod

#### Description

derive a new difference matrix from an old difference matrix by merging or deleting items

#### Synopsis

difmod [-d] [-o filename] difference-table-file translation-file

#### Options

-d
  disable check for duplicates
-o filename
  output file

#### Purpose

This program can be used to quickly derive a smaller difference matrix from a larger one, without having to rerun the lengthy calculations that were needed to derive the initial difference matrix.

#### Warning

Say, you have used the Levenshtein program to derive a difference table for six items, labelled A to F. If you join these in two items, ABC and DEF, the distance between those two items will be much less accurate than if you had run the Levenshtein program on data that was already joined into two groups, ABC and DEF.

#### See also

You can use locmod to derive the corresponding file with coordinates.