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D.5.7.2 truncateFast

Procedure from library sheafcoh.lib (see sheafcoh_lib).

Usage:
truncateFast(M,d); M module, d int

Assume:
M is graded, and it comes assigned with an admissible degree vector as an attribute 'isHomog'

Return:
module

Note:
Output is a presentation matrix for the truncation of coker(M) at d.
Fast + experimental version. M shoud be a SB!

Display:
If printlevel>=1, step-by step timings will be printed. If printlevel>=2 we add progress debug messages if printlevel>=3, even all intermediate results...

Example:
 


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