Activity
From 09 Nov 2021 to 08 Dec 2021
07 Dec 2021
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00:11 CoCoA-5 Bug #1640: MinSubsetOfGens does not find min subset
- I have now re-read the manual, and understood what it was trying to say.
Maybe re-write the manual entry to make it ... -
- I had wanted to show @MinSubsetOfGens@ to my students, but maybe it is better not to do so.
The code is weird; I a... -
- Not sure what @MinSubsetOfGens@ does, but it does not find a min card subset of the gens which generate the same idea...
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- I still get a crash with @product([x-k | k in 0..600])@ and interrupting after about 20s.
Trying with 500 instead of... -
- Naturally I discovered this while giving a demo to my students......
06 Dec 2021
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- There are only 256 subsets to try; and some can be quickly eliminated.
I saw the source, and understand that it is n... -
- I have just tried @MinSubsetOfGens@, and was surprised how slow it was on a small example....
01 Dec 2021
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- When one computes the intersection of two ideals, are the resulting generators a GBasis?
Sometimes they are: can we ...
26 Nov 2021
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- Here is an observation about the given example:
* in the case that the eigenvalue is rational (_i.e._ in the field),... -
- Anna implemented a quick fix: it was much faster, but would also sometimes give a wrong answer (we understood why).
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15:29 CoCoA-5 Slug #1629: RingElem slow with many indets
- After a common investigation via skype, we noticed that @ReadExpr@ (called by RingElem) creates @map<symbol, RingElem...
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- Simpler test:...
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- Does anyone have useful experience to help decide between Github/Gitlab/other? And also how one goes about in practice?
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- Florian and Bernhard suggest putting the source on Github/Gitlab.
25 Nov 2021
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- Some entries in the online manual are missing or very incomplete....
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- Make @NR@ work also polys with coeffs in a PID (at least in @ZZ@).
This is a stepping stone to GBasis over @ZZ@.
23 Nov 2021
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- I think the doc in @SparsePolyRing.txt@ is OK now. Do you agree, Anna?
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- The problem is that the ordering matrix has some big entry (after being converted into a matrix with positive entries...
22 Nov 2021
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- Here is a simpler failing example: I have just reduced the exponents...
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- I find the error quite surprising; at least the particular error that was thrown.
I had half expected there to be so... -
- Here is the troublesome input: it throws *@ArgTooBig@*...
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- It seems that the first two rows are "almost parallel" -- why should that be?
Anyway, it should be easy to reduce th...
19 Nov 2021
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- for example, this would be nice...
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- We agreed that the string for the name of the function should contain just the name of the function, and its argument...
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- Anna suggests that the error message should also indicate which args (via their indices, starting from 0 or 1?)
For ... -
- I believe that the error must be clear enough in CoCoALib so that there is no need to intercept (all??) situations li...
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17 Nov 2021
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- This is weird. I reverted to the old code because I wanted to confirm that it is not interruptible.
Indeed, it took... -
- I have just inserted a @CheckForInterrupt@ in the main loop for multiplication.
The simpler test example from commen... -
- Here is a simpler test example...
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- The relevant source code is probably @myMul@ in @SparsePolyOps-RingElem.C@ around line 413.
16 Nov 2021
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- One crucial factor is how much overhead it would cost if we put a check inside some inner loop.
Also how many diff... -
- I tried a (daft) example during an exercise class today: when tried to square a large polynomial it was not possible ...
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- When it happens, it happens in pairs. Run this:...
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- I confirm I (rarely) meet this error with tough examples in our development of Comprehensive Groebner Systems.
15 Nov 2021
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- Here is another example using lex:...
12 Nov 2021
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- We should update the doc so that it encourages people to apply RINGHOM directly rather than using @apply@.
We should... -
- The global @packageDir@ should probably also be of type @boost::filesystem::path@.
Currently it is @std::string@ a... -
- It seems that @filesystem::path@ was introduced in C++17.
Anna asks whether we should start compiling with standard ... -
- In some files we use @std::string@ to represent paths to files.
Replace these with values of type @filesystem::path@... -
- Which type of answer do we prefer? LIST or MAT?
If we prefer MAT, are the eigenvectors the rows or the columns? ... -
- Here is a list of things to attend to when updating to C++17
* currently Scott Meyers does not have a C++17 book, so... -
- This issue is for gathering notes about updating to C++17 (from C++14).
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- Check if this is still a problem!
What does Robbiano do?
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- I have just tested what happens if there is some unsent input in the CoCoA-5, and it seems to discard the unsent inpu...
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- Might it make sense to bind also @C-c h@ and perhaps @C-c ?@ or even @C-c C-?@
Just some suggestions.... maybe t... -
- Done for the CoCoA-5 menu.
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- it is probably easy to add it to the cocoa5-comint menu.
What about the keybinding?
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- Website seems ok now.
Closing.
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- We need to decide what the restrictive message should say.
Ideally it should be just 1 or 2 lines long, and placed v... -
- We need to consider also the copyright notices in the sources for CoCoA-5.
Should the copyright notice for CoCoA-5 f... -
- No longer crashes. So that's good.
Now we just need to clean up the path, but that's in a new issue #1631 -
- Anna is reasonably convinced by the idea. She made some alternative proposals:
* use all capital letters for names ... -
- No new bugs have surfaced. Closing this issue.
10 Nov 2021
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- Bruns reported by email that CoCoALib does not compile on an @"msys"@ platform because @sigaction@ is absent.
Inve... -
- Is there documentation now?
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- I have updated the documentation to the current behaviour.
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- I have decided to "test" the idea of putting a single underscore at the start of names.
I have just modified @bug-... -
- I made the change about a year ago (according to redmine), and no complaints have surfaced.
So advancing to *feedbac... -
- No real chance of finding time to resolve this in the foreseeable future :-(
Probably not that hard, but it will sur... -
- Anna: can you close this issue?
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- We probably need to change the fn @CoCoAManFileName@ (around line 950 in @OnlineHelp.C@).
The return type should be ... -
- There is a stackoverflow thread about getting @dirname@: https://stackoverflow.com/questions/3071665/getting-a-direct...
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- It would be nice (& cleaner) if we could get rid of @packages/../@.
I think this should be possible.
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- I have modified the error message slightly. Now it gives:...
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- My current opinion is to return the exit code, even if this is not well defined (in a portable way).
This would allo... -
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