Activity
From 14 Sep 2018 to 13 Oct 2018
05 Oct 2018
- 17:44 CoCoA-5 Slug #1229 (New): append is slow
- Creating a long list by calling @append@ in a loop has run-time quadratic in the final list length.
- 17:43 CoCoA-5 Slug #1228: SLUG: filling an array
- It does not really matter how we evaluate @LHS := RHS@.
Either side could be expensive to evaluate. Publicly we sho...
04 Oct 2018
- 09:01 CoCoA-5 Slug #1228: SLUG: filling an array
- My proposal in comment 11 is *bad* because, for instance, the computation of an index may be lengthy or may have side...
03 Oct 2018
- 15:03 CoCoA-5 Slug #1228: SLUG: filling an array
- John Abbott wrote:
> I would hope that checking writability is cheap...
We will make some checks.
I want to desi... - 14:43 CoCoA-5 Slug #1228: SLUG: filling an array
- Here is an alternative to my comment about the semantics of assignment (in comment 7):
# check that @LHS@ is writabl... - 14:27 CoCoA-5 Slug #1228: SLUG: filling an array
- Yes, we cannot (and probably should not) stop the user from "shooting himself in the foot".
But CoCoA-5 should never...
02 Oct 2018
- 19:43 CoCoA-5 Slug #1228: SLUG: filling an array
- John Abbott wrote:
> I am inclined to think that a user who writes an assignment @LHS := RHS;@ where evaluating @RHS... - 17:05 CoCoA-5 Slug #1228: SLUG: filling an array
- A potential disadvantage of my proposed semantics is that if the RHS is expensive to evaluate, and the LHS is "obviou...
- 16:51 CoCoA-5 Slug #1228: SLUG: filling an array
- Now I fear there may be some "strange" situations in which nasty things may occur:...
- 15:46 CoCoA-5 Slug #1228: SLUG: filling an array
- I have changed @IndexedAccess::assignmentNeedsOwnership@ so that it gives @false@.
The loop is much faster (0.001s a... - 15:26 CoCoA-5 Slug #1228: SLUG: filling an array
- In @Interpreter.C@ around line 2065 there is:...
- 15:20 CoCoA-5 Slug #1228: SLUG: filling an array
- I have used profiling to confirm that the list is indeed copied (but why???)
The test code is:...
01 Oct 2018
- 11:16 CoCoA-5 Slug #1228 (In Progress): SLUG: filling an array
- I have just tried the third loop again, but after making the list @sieve@ twice as long, and the loop takes almost tw...
30 Sep 2018
- 10:11 CoCoA-5 Slug #1228: SLUG: filling an array
- I forgot to mention that @N := 9699690@ (product of all primes up to 20).
The third loop is *APPALLINGLY SLOW*, *... - 10:08 CoCoA-5 Slug #1228 (In Progress): SLUG: filling an array
- It seems that assigning to an array element is surprisingly slow.
Look at the timings in the following session:
<...
29 Sep 2018
- 12:51 CoCoALib Design #1223 (Resolved): NewPolyRing default indet names
- Removed the doc. Moved the old fns into obsolescent.
28 Sep 2018
- 20:36 CoCoALib Design #1223: NewPolyRing default indet names
- Just to remember.
This should go into obsolescent. - 18:05 CoCoALib Design #1223: NewPolyRing default indet names
- I have updated the code: sources, tests and examples.
Everything compiles, and the tests pass (after changing some e... - 14:57 CoCoALib Design #1223: NewPolyRing default indet names
- John Abbott wrote:
> Do you prefer *(A)* or *(B)* ? Opinions?
I prefer A, as I had already explained.
- 14:51 CoCoALib Design #1223: NewPolyRing default indet names
- I see two possible actions:
*(A)* remove completely the pseudo-ctor which accepts just the number of indets; the cal...
21 Sep 2018
- 16:17 CoCoALib Feature #1227: exgcd; solve Bezout equation
- Maybe restricting the problem to just 2 args is too limiting?
Consider the following 3 multivariate polynomials: @...
19 Sep 2018
- 14:23 CoCoALib Feature #1227: exgcd; solve Bezout equation
- According to Wikipedia there are Bezout domains which are not PIDs (but it seems all such non PIDs are "funny rings" ...
- 14:13 CoCoALib Feature #1227 (New): exgcd; solve Bezout equation
- I'd like to use an *@exgcd@* function: one which calculates both the GCD and the corresponding linear combination of ...
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