Activity
From 18 Sep 2018 to 17 Oct 2018
05 Oct 2018
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17:44 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.
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17:43 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
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09:01 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
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15:03 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 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 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
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19:43 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 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...
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16:51 Slug #1228: SLUG: filling an array
- Now I fear there may be some "strange" situations in which nasty things may occur:...
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15:46 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 Slug #1228: SLUG: filling an array
- In @Interpreter.C@ around line 2065 there is:...
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15:20 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
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11:16 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
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10:11 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 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:
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