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What's the difference between hard and soft floating point numbers?
...hine-independent and bit-exact (soft float) in accuracy-critical parts and fast (hard float) in parts where small deviations don't matter.
– PhilLab
May 29 '17 at 12:18
...
When to favor ng-if vs. ng-show/ng-hide?
...n the DOM have less performance impact and your web app might appear to be faster when using ng-if compared to ng-show/ng-hide. In my experience, the difference is negligible. Animations are possible when using both ng-show/ng-hide and ng-if, with examples for both in the Angular documentation.
Ult...
Select random lines from a file
...
@MonaJalal nope just faster, since it doesn't have to compare lines at all.
– rogerdpack
May 15 '17 at 17:20
...
Quicksort vs heapsort
... the worst-case running
time is always Θ(nlogn). Quicksort is
usually faster, though there remains
the chance of worst case performance
except in the introsort variant, which
switches to heapsort when a bad case
is detected. If it is known in advance
that heapsort is going to be
nec...
Why is XOR the default way to combine hashes?
...not after further inspection.
On modern hardware, adding usually about as fast as xor (it probably uses more power to pull this off, admittedly). Adding's truth table is similar to xor on the bit in question, but it also sends a bit to the next bit over when both values are 1. This means it erase...
Storing time-series data, relational or non?
...an Index to support the columns identified in the WHERE clause, it is very fast, and the query does not depend on the size of the table (grabbing 1,000 rows from a 16 billion row table is instantaneous).
Your table has one serious impediment. Given your description, the actual PK is (Device, Metric...
Split (explode) pandas dataframe string entry to separate rows
...generalized which could be applied to DF with more than two columns and as fast, well almost, as fast as AFinkelstein's solution):
In [2]: df = pd.DataFrame(
...: [{'var1': 'a,b,c', 'var2': 1, 'var3': 'XX'},
...: {'var1': 'd,e,f,x,y', 'var2': 2, 'var3': 'ZZ'}]
...: )
In [3]: df
Out...
How to undo 'git reset'?
...n HEAD:
$ git reflog show master
c24138b master@{0}: merge origin/master: Fast-forward
90a2bf9 master@{1}: merge origin/master: Fast-forward
[...]
This should have less noise it in than the general HEAD reflog.
share
...
Building and running app via Gradle and Android Studio is slower than via Eclipse
...seful for tweaking memory settings.
# https://medium.com/google-developers/faster-android-studio-builds-with-dex-in-process-5988ed8aa37e#.krd1mm27v
org.gradle.jvmargs=-Xmx5120m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8
# When configured, Gradle will run in incubatin...
byte[] to hex string [duplicate]
...code off this.
The result is that BitConverter+String.Replace seems to be faster than most other simple ways. But the speed can be improved with algorithms like Nathan Moinvaziri's ByteArrayToHexString or Kurt's ToHex.
I also found it interesting that string.Concat and string.Join are much slower...