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Java HashMap performance optimization / alternative
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One thing I notice in your hashCode() method is that the order of the elements in the arrays a[] and b[] don't matter. Thus (a[]={1,2,3}, b[]={99,100}) will hash to the same value as (a[]={3,1,2}, b[]={100,99}). Actually all keys k1 and k2 where sum(k1.a)==sum(k2.a) and sum(k1.b)=s...
How to abandon a hg merge?
...e with regular expressions. Something as simple as replacing what matches ^____ (use 4 spaces instead of underscores) with __ (2 spaces), repeated a few times (unless you have insanely some nested code) should work.
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How does one generate a random number in Apple's Swift language?
...swered Jun 3 '14 at 4:32
Catfish_ManCatfish_Man
38.6k1111 gold badges6363 silver badges8181 bronze badges
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Why Would I Ever Need to Use C# Nested Classes [duplicate]
...like this ...
class A
{
//used to help implement A
class B
{
A m_a;
internal B(A a) { m_a = a; }
...methods of B can access private members of the m_a instance...
}
...etc...
}
... and constructed from a method of A using code like this ...
//create an instance of B, whose ...
Pros and cons of Java rules engines [closed]
...stablished algorithms (such as forward chaining and the Rete algorithm) in order to scale up to non-trivial problems. If you are simply evaluating expressions, an existing library such as MVEL may be useful.
– jevon
Feb 28 '11 at 6:19
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SQL query to select dates between two dates
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You might mention that the order matters in the BETWEEN function. It has to go from oldest on the left and more recent on the right. This is unintuitive as = is a comparative operator in sql and works for both "EmployeeId = 1" or "1 = EmployeeId" in t...
System.Data.SQLite Close() not releasing database file
... for me.
I had to add GC.WaitForPendingFinalizers() after GC.Collect() in order to proceed with the file deletion.
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How to convert a string of bytes into an int?
...thon 3.2 and later, use
>>> int.from_bytes(b'y\xcc\xa6\xbb', byteorder='big')
2043455163
or
>>> int.from_bytes(b'y\xcc\xa6\xbb', byteorder='little')
3148270713
according to the endianness of your byte-string.
This also works for bytestring-integers of arbitrary length, and f...
Bootstrap 3 jquery event for active tab change
...I'm not getting any alert. Not even an error message. What should I do, in order to bring it outside that loop? I've declared the variable outside the document.ready function.
– SSS
Nov 2 '16 at 12:31
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Split column at delimiter in data frame [duplicate]
...b','b|c','x|y'))
library(splitstackshape)
cSplit(df, "FOO", "|")
# ID FOO_1 FOO_2
# 1 11 a b
# 2 12 b c
# 3 13 x y
This particular function also handles splitting multiple columns, even if each column has a different delimiter:
df <- data.frame(ID=11:13,
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