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I found a performance issue when vertically concatenating sparse matrices. Here is a minimal example:
```
N = 1000000;
A = sprandn(N,N,1e-5);
Z = spzeros(N,N);
@time B = [Z;A];
elapsed time: 1.359868…
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Reported by N. Cohen
```
sage: designs.difference_family(9,3)
Traceback (most recent call last):
...
RuntimeError:
```
CC: @nathanncohen
Component: **combinatorial designs**
Author: **Vincent …
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```
For some reason, WZ is loading slowly. Now, some slowdown is fine, but +3
seconds from the previous release is a bit silly. We're at the point now where
WZ is nearly release-ready, so performanc…
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Implement twographs and Seidel switching to realise more entries in Brouwer database
Depends on #18960
Depends on #18948
Depends on #18988
Depends on #18991
Depends on #18986
Depends on #19018
Dep…
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I think that Herb Sutter pretty much destroyed the arguments for the copy-then-move idiom at CPPCon -- let's stop using/recommending this. Major counterarguments are:
-can't re-use existing capacity …
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Hello,
For WordCamp Rio on Brazil, we have been talking that would be interesting to have a smart system to decide the talks order and organize the talks rooms. We think that this system could be int…
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This is a metabug to group together a bunch of related issues do with our current generation of LLVM IR.
The IR we produce is _very_ verbose, this causes an inordinate amount of time to be spent duri…
Aatch updated
10 years ago
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We've been working on an updated version of our comparison of a battery of test systems across OpenMM platforms to ensure that potential energies and forces agree.
We recently updated our test for Sr…