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1/23/2015  UT Dallas

POEC 6382 Applied GIS Software

28

Modifying numeric records in Feature Attribute Tables

CALCULATE assigns numeric values to items.

   CALCULATE <cover> <feature_class> <target_item>  =  <arithmetic_expression>

or

   CALCULATE <info_file> INFO <target_item>   =    <arithmetic_expression>

Example:  Arcplot:  calculate   pub   point   key   =   1

       Arcplot:  calculate   pub.pat   INFO   key   =   1

Example 2: Arc: tables

         Enter command: select aircover.pat

         Enter command: calculate   air-id   =   aircover-id

         Enter command: quit

         Arc: list aircover.pat      (to make sure variables correctly calculated)

-  Requires that item key has been defined as numeric

- The CALCULATE command operates on all currently selected features within the coverage, or  all selected records in the INFO file. This may be one, some or all records.

Note:  there must be a space on each side of the equal sign:   a    =    b

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