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D.3.1.7 is_complex

Procedure from library matrix.lib (see matrix_lib).

Usage:
is_complex(c); c = list of size-compatible modules or matrices

Return:
1 if c[i]*c[i+1]=0 for all i, 0 if not, hence checking whether the list of matrices forms a complex.

Note:
Ideals are treated internally as 1-line matrices.
If printlevel > 0, the position where c is not a complex is shown.

Example:
 


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            User manual for Singular version 3-1-6, Dec 2012, generated by texi2html.