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Problem: Selection on a raster returns an error if no output raster is specified in the Raster Calculator

Description

Typing "[inlayer] == 5" in the Raster Calculator returns the error "Failed to evaluate the calculator equation" but typing "outgrid = [inlayer] == 5" works.

Cause

This is a known issue with ArcGIS 8.1 and 8.1.2.

Solution or Workaround

Upgrade to ArcGIS 8.2.