Macaulay2

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Federico Galetto, Doug Torrance3

12/20/25

Symbol conflict upon package install

Spot on! Thank you, Doug. I started importing Permutations, which exports Posets, which exports

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Symbol conflict upon package install

Spot on! Thank you, Doug. I started importing Permutations, which exports Posets, which exports

12/20/25

Anoot Yadav

12/18/25

Computing local cohomology of the fiber cone in Macaulay2

Hi, I am trying to compute the local cohomology modules of the fiber cone of an ideal using Macaulay2

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Computing local cohomology of the fiber cone in Macaulay2

Hi, I am trying to compute the local cohomology modules of the fiber cone of an ideal using Macaulay2

12/18/25

Theo Sandstrom, Mahrud Sayrafi2

12/3/25

Constructing maps to non-free modules is slow

I agree that all of this should be instantaneous, and there's a discussion about it at issue #

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Constructing maps to non-free modules is slow

I agree that all of this should be instantaneous, and there's a discussion about it at issue #

12/3/25

Shrikant Shekhar 1910404, Astro Naut3

11/21/25

Problem computing h-vector in non-standard grading

Oh I understand that's because of grading. Thanks for replying. Shrikant. On Friday, October 31,

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Problem computing h-vector in non-standard grading

Oh I understand that's because of grading. Thanks for replying. Shrikant. On Friday, October 31,

11/21/25

Doug Torrance

11/14/25

Macaulay2 1.25.11 released

Dear Macaulay2 user, We are happy to announce the release of Macaulay2, version 1.25.11. For the list

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Macaulay2 1.25.11 released

Dear Macaulay2 user, We are happy to announce the release of Macaulay2, version 1.25.11. For the list

11/14/25

Kumar Sannidhya Shukla, Federico Galetto3

11/7/25

Change the degrees in the underlying ring of a simplicial complex.

Hello Federico, Thank you for your response. I can't create the simplicial complex in a different

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Change the degrees in the underlying ring of a simplicial complex.

Hello Federico, Thank you for your response. I can't create the simplicial complex in a different

11/7/25

Federico Galetto, Doug Torrance5

11/6/25

Distributing Python code with M2 package

Wonderful, thank you! I may have future questions when I actually get to try this, but this is great

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Distributing Python code with M2 package

Wonderful, thank you! I may have future questions when I actually get to try this, but this is great

11/6/25

Irena Swanson, Doug Torrance3

11/6/25

new install and M2 works in the terminal only from the main directory

You are so right, Doug. Thank you. I removed those files and now M2 works. Thanks! Irena On Thursday,

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new install and M2 works in the terminal only from the main directory

You are so right, Doug. Thank you. I removed those files and now M2 works. Thanks! Irena On Thursday,

11/6/25

Kumar Sannidhya Shukla

10/29/25

About the isRegularSequence method.

Hello Macaulay2 users, I had a question about the isRegularSequence method from the Depth package.

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About the isRegularSequence method.

Hello Macaulay2 users, I had a question about the isRegularSequence method from the Depth package.

10/29/25

Doug Torrance

10/15/25

Forthcoming release 1.25.11

Dear Macaulay2 authors and workshop participants, Thank you all for your work for the mathematical

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Forthcoming release 1.25.11

Dear Macaulay2 authors and workshop participants, Thank you all for your work for the mathematical

10/15/25

David Eisenbud, Karl Schwede2

10/1/25

bug in randomPoints

Hi David, I'll take a look and get back. On Mon, Sep 29, 2025, 5:26 PM 'David Eisenbud'

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bug in randomPoints

Hi David, I'll take a look and get back. On Mon, Sep 29, 2025, 5:26 PM 'David Eisenbud'

10/1/25

Federico Galetto, Mahrud Sayrafi3

10/1/25

fixing ambiguous references

That did it! Thank you very much! On Tuesday, September 30, 2025 at 6:38:14 PM UTC-4 mah...@umn.edu

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fixing ambiguous references

That did it! Thank you very much! On Tuesday, September 30, 2025 at 6:38:14 PM UTC-4 mah...@umn.edu

10/1/25

Doug Torrance

9/19/25

Debian package repository updates

Debian users: There have been some updates to the instructions for downloading Macaulay2 Debian

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Debian package repository updates

Debian users: There have been some updates to the instructions for downloading Macaulay2 Debian

9/19/25

naddi...@gmail.com, Doug Torrance3

9/6/25

bug using toField twice

Thanks for the report! I've opened an issue on GitHub: https://github.com/Macaulay2/M2/issues/

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bug using toField twice

Thanks for the report! I've opened an issue on GitHub: https://github.com/Macaulay2/M2/issues/

9/6/25

David Eisenbud, Doug Torrance4

9/1/25

package problem with "res"

Thanks, Doug! -- David -- David Eisenbud Professor of Mathematics University of California Berkeley

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package problem with "res"

Thanks, Doug! -- David -- David Eisenbud Professor of Mathematics University of California Berkeley

9/1/25

Doug, Doug Torrance6

9/1/25

toString

The "printWidth" variable controls when we wrap the output. If it's set to 0, then we

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toString

The "printWidth" variable controls when we wrap the output. If it's set to 0, then we

9/1/25

David Eisenbud, Mike Stillman3

8/25/25

F11 and a renamed buffer

Thanks Mike (again)! -- David Eisenbud Professor of Mathematics University of California Berkeley

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F11 and a renamed buffer

Thanks Mike (again)! -- David Eisenbud Professor of Mathematics University of California Berkeley

8/25/25

Anton

8/4/25

Macaulay2Web at Georgia Tech

Please check out a new Macaulay2Web server https://macaulay2.math.gatech.edu/ and report any issues.

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Macaulay2Web at Georgia Tech

Please check out a new Macaulay2Web server https://macaulay2.math.gatech.edu/ and report any issues.

8/4/25

iqra khan, David Eisenbud2

7/24/25

Command not working

In many homogeneous cases the fastest thing is to write the ringor module M in terms of a graded

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Command not working

In many homogeneous cases the fastest thing is to write the ringor module M in terms of a graded

7/24/25

Reginald Anderson, … Thomas Kahle16

7/7/25

Detecting whether digraph has cycles

Ah -- I suppose one can also just create a digraph without including the self-loops 😊. So this should

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Detecting whether digraph has cycles

Ah -- I suppose one can also just create a digraph without including the self-loops 😊. So this should

7/7/25

Federico Galetto, Mahrud Sayrafi3

6/24/25

error: expected first parameter to be a hash table

Great, thank you so much! Exporting "Complexes" and changing all instances of ChainComplex

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error: expected first parameter to be a hash table

Great, thank you so much! Exporting "Complexes" and changing all instances of ChainComplex

6/24/25

mike stillman, … Paul Zinn-Justin16

6/13/25

Announcement

Macaulay2 web server

The unimelb-macaulay2 Macaulay2Web server is down for reasons that are beyond my control. Hopefully

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Announcement

Macaulay2 web server

The unimelb-macaulay2 Macaulay2Web server is down for reasons that are beyond my control. Hopefully

6/13/25

Nickolay Trendafilov

6/6/25

regression on simplexes

Hi, my field of interests is multivariate data analysis. Nevertheless, I have a problem that might be

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regression on simplexes

Hi, my field of interests is multivariate data analysis. Nevertheless, I have a problem that might be

6/6/25

Doug Torrance

6/2/25

Macaulay2 1.25.06 released

Macaulay2 1.25.06 has been released. This is a minor patch version with very few changes from 1.25.05

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Macaulay2 1.25.06 released

Macaulay2 1.25.06 has been released. This is a minor patch version with very few changes from 1.25.05

6/2/25

Hola

6/2/25

K-basis of Homology of a simplicial complex

The question concerns how to compute a K-basis of the group homology of a simplicial complex. Using

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K-basis of Homology of a simplicial complex

The question concerns how to compute a K-basis of the group homology of a simplicial complex. Using

6/2/25

Kriti Goel, Michael Burr5

5/30/25

optional inputs for associatedPrimes

This was helpful. Thanks! I will run some examples to compare the computational timings via this

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optional inputs for associatedPrimes

This was helpful. Thanks! I will run some examples to compare the computational timings via this

5/30/25

David Eisenbud

5/29/25

(res, Module, ZZ)

In the new system, when making a resolution over a factor (non-regular) ring (which I often do!), it

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(res, Module, ZZ)

In the new system, when making a resolution over a factor (non-regular) ring (which I often do!), it

5/29/25

Kumar Sannidhya Shukla

5/26/25

isSmooth giving unexpected results.

Hello Macaulay2 users, Calling isSmooth on a toric variety is giving unexpected result. Consider the

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isSmooth giving unexpected results.

Hello Macaulay2 users, Calling isSmooth on a toric variety is giving unexpected result. Consider the

5/26/25

Wbwvwv 2fwcweg, … Lily Silverstein3

5/23/25

Extracting one-degree terms from polynomial

It could also be helpful to use "any" and "all" here. select(L, m -> any(

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Extracting one-degree terms from polynomial

It could also be helpful to use "any" and "all" here. select(L, m -> any(

5/23/25

Hola

5/23/25

Transforming undirected trees into directed trees - Macaulay2/NautyGraphs

I'm working with the NautyGraphs package in Macaulay2, and I use it to generate all the

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Transforming undirected trees into directed trees - Macaulay2/NautyGraphs

I'm working with the NautyGraphs package in Macaulay2, and I use it to generate all the

5/23/25