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Why doesn't GCC optimize a*a*a*a*a*a to (a*a*a)*(a*a*a)?
... of the answer.
As a result, most compilers are very conservative about reordering floating point calculations unless they can be sure that the answer will stay the same, or unless you tell them you don't care about numerical accuracy. For example: the -fassociative-math option of gcc which allows...
How do I (or can I) SELECT DISTINCT on multiple columns?
.... I suggest a serial or an IDENTITY column in Postgres 10+.
Related:
In-order sequence generation
Auto increment table column
How is this faster?
The subquery in the EXISTS anti-semi-join can stop evaluating as soon as the first dupe is found (no point in looking further). For a base table wit...
How to sort a file, based on its numerical values for a field?
...614990234375
-0.907928466796875
1.135406494140625
Which is obviously not ordered by numeric value.
Then, I guess that a more precise answer would be to use sort -n but only if all the values are positive.
P.S.: Using sort -g returns just the same results for this example
Edit:
Looks like the l...
What does middleware and app.use actually mean in Expressjs?
...example?, how can you pass in so many functions into app.get(...) and what order are they called?
– Tanner Summers
Mar 27 '18 at 15:20
2
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What algorithm can be used for packing rectangles of different sizes into the smallest rectangle pos
...ccommodate R, a new level is created.
Bottom-Left (BL) Algorithm
BL first order items by non-increasing width. BL packs the next item as near to the bottom as it will fit and then as close to the left as it can go without overlapping with any packed item. Note that BL is not a level-oriented packin...
Sorting an array of objects in Ruby by object attribute?
...
Ascending order :
objects_array.sort! { |a, b| a.attribute <=> b.attribute }
or
objects_array.sort_by{ |obj| obj.attribute }
Descending order :
objects_array.sort! { |a, b| b.attribute <=> a.attribute }
or
obje...
Mapping a function on the values of a map in Clojure
...
I like it, but is there any reason for the arguments order (besides the question) ? I was expecting [f m] as in map for some reason.
– nha
Aug 21 '16 at 22:48
...
PHP best way to MD5 multi-dimensional array?
.../Optionally make a copy of the array (if you want to preserve the original order)
$original = $array;
array_multisort($array);
$hash = md5(json_encode($array));
Edit: There's been some question as to whether reversing the order would produce the same results. So, I've done that (correctly) here:
...
SQLAlchemy: What's the difference between flush() and commit()?
...the remote server. It turns out that due to the way sqlalchemy is written, order of operations when committing is not guaranteed. This resulted in adding a duplicate version (before attempting to delete the old one), which resulted in the DB failing a unique constraint. To get around this I used flu...
Mac OSX Lion DNS lookup order [closed]
After upgrading to Mac OSX Lion I figured out that /etc/hosts is not looked up in first place for name resolution anymore. This leads to some side effects like:
...