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Feature #1427

New function: LawrenceMat

Added by Anna Maria Bigatti about 4 years ago. Updated about 4 years ago.

Status:
Closed
Priority:
Normal
Assignee:
Anna Maria Bigatti
Category:
New Function
Target version:
CoCoALib-0.99700
Start date:
27 Feb 2020
Due date:
% Done:

100%

Estimated time:
1.23 h
Spent time:
1.20 h

Description

Bring LawrenceMat into CoCoALib.
Currenly hidden in toric.cpkg5

History

#1 Updated by Anna Maria Bigatti about 4 years ago

  • % Done changed from 0 to 60

essentially done
now testing

#2 Updated by Anna Maria Bigatti about 4 years ago

  • Status changed from New to Feedback

Done. Tested, Documented. Checking in.

#3 Updated by John Abbott about 4 years ago

  • % Done changed from 60 to 80

What is the definition of Lawrence lifting?

I found a paper on ArXiV: arxiv.org/pdf/1508.05461.pdf which gives a slightly different defn.

#4 Updated by John Abbott about 4 years ago

Any objections to changing the return type to ConstMatrixView?
It seems more "natural/efficient" to me than necessarily building a DenseMat... that's all.

UPDATE but it probably makes it harder to export to CoCoA-5. I'll leave it is as it is.

#5 Updated by John Abbott about 4 years ago

  • Status changed from Feedback to Closed
  • % Done changed from 80 to 100
  • Estimated time changed from 1.00 h to 1.23 h

#6 Updated by Anna Maria Bigatti about 4 years ago

John Abbott wrote:

Any objections to changing the return type to ConstMatrixView?
It seems more "natural/efficient" to me than necessarily building a DenseMat... that's all.

UPDATE but it probably makes it harder to export to CoCoA-5. I'll leave it is as it is.

I think we can do it! after all many functions for matrices are like that.

definition

I used my definition which I already had for toric.
And that is also the used in KR book and by Herzog in his Hue lectures.

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