HomologicalShiftIdeals - A Macaulay2 package for computing the homological shift ideals of a monomial ideal of a polynomial ring

[Antonino-Ficarra]

A Macaulay2 package for computing the homological shift ideals of a monomial ideal of a polynomial ring

[d-torrance]

Thanks for your contribution!

Both new package files should have the .m2 file extension.

[Antonino-Ficarra]

Thanks for your contribution!

Both new package files should have the .m2 file extension.

Ok, sorry. I added the ".m2" extension.

[Antonino-Ficarra]

I forgot a semicolon

[Antonino-Ficarra]

I forgot some semicolons

[d-torrance]

Those semicolons don't really matter. The only time when you definitely need semicolons is when a function body contains multiple statements:

f = x -> (
  statement1;
  statement2;
  statement3;
  statement4)

The other time is when you want to suppress the output when interacting directly with Macaulay2.

[d-torrance]

This is the same map that was constructed for toMultidegree, but you're applying it to an ideal instead of a ring element. Perhaps you could extract this code into a helper function that both methods could call? (DRY principle when programming -- don't repeat yourself!)

[Antonino-Ficarra]

I took into account the precious suggestion of D Torrance

[Antonino-Ficarra]

I fixed a typo

[Antonino-Ficarra]

Fixed a typo

[Antonino-Ficarra]

Added a needed flatten

[d-torrance]

Now the admissableOrder example is failing with the following:

i4 : S = QQ[x,y];

i5 : I = ideal(x^2,y^2);

o5 : Ideal of S

i6 : admissibleOrder I
stdio:6:15:(3): error: the ideal does not have linear quotients