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How does BLAS get such extreme performance?
...face.
Firstly I will mention things that are largely unrelated:
Fortran vs C, makes no difference
Advanced matrix algorithms such as Strassen, implementations dont use them as they dont help in practice
Most implementations break each operation into small-dimension matrix or vector operations i...
Shell equality operators (=, ==, -eq)
...true or 0. So many are bitten by this bug:
$ [[ 10 < 2 ]]; echo $?
0
vs the correct test for 10 being arithmetically less than 2:
$ [[ 10 -lt 2 ]]; echo $?
1
In comments, there is a question of the technical reason using the integer -eq on strings returns True for strings that are not the...
Performance surprise with “as” and nullable types
... syntax is indeed 1 byte smaller, it mostly wins big by making zero calls (vs. two) and avoiding the unbox operation altogether when possible.
// static void test1(Object o, ref int y)
// {
// int? x = o as int?;
// if (x.HasValue)
// y = x.Value;
// }
[0] valuetype [mscorlib]Nulla...
When do you use POST and when do you use GET?
... edited Jun 6 '18 at 20:33
vs97
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answered Sep 5 '08 at 19:12
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ReadOnlyCollection or IEnumerable for exposing member collections?
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@VojislavStojkovic you can't use bar.Foos[17] with IReadOnlyCollection. The only difference is additional Count property. public interface IReadOnlyCollection<out T> : IEnumerable<T>, IEnumerable
– ...
What Content-Type value should I send for my XML sitemap?
... response is, and conclude (as with What's the difference between text/xml vs application/xml for webservice response) that both text/xml and application/xml are permissible. However, none address whether there are any rules specific to sitemaps.
Answer: there aren't. The sitemap spec is https://ww...
Getting an element from a Set
...ements of a Set is more work than getting a single value from a Map. (O(N) vs O(1))
– Jamie Flournoy
Oct 5 '18 at 21:16
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Control the dashed border stroke length and distance between strokes
...
@WilliamHampshire I would go with this technique youtu.be/vs34f9FiHps?t=779 but check accepted answer, you might like other solutions better
– godblessstrawberry
Sep 21 '18 at 12:55
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Difference between len() and .__len__()?
...e different paths depending on the objects involved) -- in the case of len vs __len__, it's just a bit of sanity checking on the built-in that is missing from the magic method:
>>> class bah(object):
... def __len__(self): return "an inch"
...
>>> bah().__len__()
'an inch'
>...
How to create materialized views in SQL Server?
...d then you notice the difference. The advantage of using the indexed views vs "properly indexing the tables" is in limiting the record selection, otherwise you are correct, it would be the same.
– ajeh
Aug 10 '16 at 21:11
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