#### Description:

This attribute indicates whether a Mapping has been simplified by the astSimplify method. If the IsSimple value is non-zero, then the Mapping has been simplified and so there is nothing to be gained by simplifying it again. Indeed, the astSimplify method will immediately return the Mapping unchanged if the IsSimple attribute indicates that the Mapping has already been simplified.

Type:

  Integer (boolean), read-only.

#### Applicability

##### Mapping

All Mappings have this attribute.

##### Frame

All classes of Frame return zero for the IsSimple attribute. This is because changes can be made to a Frame which affect the Mapping represented by the Frame, and so there can be no guarantee that the Mapping may not need re-simplifying. Most non-Frame Mappings, on the other hand, are immutable and so when they are simplified it is certain that they weill remain in a simple state.
Copyright (C) 2021 East Asian Observatory