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7.3.8 imap (plural)

Syntax:
imap ( ring_name, name )
Type:
number, poly, vector, ideal, module, matrix or list (the same type as the second argument)
Purpose:
identity map on common subrings. imap is the map between rings and qrings with compatible ground fields which is the identity on variables and parameters of the same name and 0 otherwise. (See map (plural) for a description of possible mappings between different ground fields). Useful for mappings from a homogenized ring to the original ring or for mappings from/to rings with/without parameters. Compared with fetch, imap uses the names of variables and parameters. Unlike map and fetch, imap can map parameters to variables.
Example:
 
See fetch (plural); map (plural); qring (plural); ring (plural).


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