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Feature #1439

New function: LinearForm

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

Status:
Closed
Priority:
Normal
Assignee:
Anna Maria Bigatti
Category:
CoCoA-5 function: new
Target version:
CoCoA-5.3.0
Start date:
07 Mar 2020
Due date:
% Done:

100%

Estimated time:
5.20 h
Spent time:
5.10 h

Description

Add function which returns the sum of the summends of degree 1.

Related issues

Related to CoCoALib - Feature #1022: New "LF" function which is based on StdDegNew2017-03-06

History

#1 Updated by Anna Maria Bigatti about 4 years ago

Done (in NotBuiltin.cpkg5)

Funny cases:
if f = 0 returns 0
if GradingDim<>1 returns error
use weights: es:

/**/ OrdM := matrix([[2,3,1],[0,0,-1],[0,-1,0]]);
/**/ P := NewPolyRing(QQ, "a,b,c", OrdM, 1); -- 3 indeterminates
/**/ use P;
/**/ LinearForm(a+b+c);
c

#2 Updated by Anna Maria Bigatti about 4 years ago

  • Status changed from New to Resolved
  • % Done changed from 0 to 80

documentation done
(but checkin later -- flat battery)

#3 Updated by Anna Maria Bigatti about 4 years ago

  • Status changed from Resolved to Feedback
  • % Done changed from 80 to 90
  • Estimated time set to 2.51 h

updated RelNotes
Checked in everything

#4 Updated by John Abbott about 4 years ago

Do we have a function which computes a list of homog compts?

#5 Updated by Anna Maria Bigatti about 4 years ago

John Abbott wrote:

Do we have a function which computes a list of homog compts?

no, we explicitely decided not to, for its intrinsic use of memory.
We implemented LF and to promoted iterating over.

#6 Updated by Anna Maria Bigatti about 4 years ago

  • Related to Feature #1022: New "LF" function which is based on StdDeg added

#7 Updated by John Abbott about 4 years ago

I now have a prototype of HomogForm(f,d) in C++.
It seems to be about 30 times faster than LinearForm in CoCoA-5.
Should I put it into CoCoALib? Or shall I delay it until the next release?

#8 Updated by Anna Maria Bigatti about 4 years ago

John Abbott wrote:

I now have a prototype of HomogForm(f,d) in C++.
It seems to be about 30 times faster than LinearForm in CoCoA-5.
Should I put it into CoCoALib? Or shall I delay it until the next release?

Put it in CoCoALib: we still have problems with the linux release, and I haven't made the CoCoALib release official yet (nor cocoa for M$).

#9 Updated by John Abbott about 4 years ago

What should the fn name be? HomogForm or HomogCompt?

#10 Updated by John Abbott about 4 years ago

  • Estimated time changed from 2.51 h to 5.20 h

I have implemented HomogCompt. Also accessible from CoCoA-5 (with man page).
No tests, no CoCoALib doc (oops... I'll fix that now).

Checked in.

#11 Updated by John Abbott about 4 years ago

Added doc for CoCoALib.
Still no test :-/
Close anyway?

#12 Updated by John Abbott about 4 years ago

  • Status changed from Feedback to Closed
  • % Done changed from 90 to 100

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