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How to count the number of true elements in a NumPy bool array
... numpy)? If it is not guaranteed, I will add a check, 'if True==1:' beforehand. About count_nonzero(..), unfortunately, it seems not implemented in my numpy module at version 1.5.1, but I may have a chance to use it in the future.
– norio
Dec 3 '11 at 1:52
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Does deleting a branch in git remove it from the history?
... source tree, it is a very different structure from svn where all branches and tags (by convention) live in separate 'folders' of the repository alongside the special 'trunk'.
If the branch was merged into another branch before it was deleted then all of the commits will still be reachable from the...
Are Roslyn SyntaxNodes reused?
I've been taking a look to Roslyn CTP and, while it solves a similar problem to the Expression tree API , both are immutable but Roslyn does so in a quite different way:
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What specifically are wall-clock-time, user-cpu-time, and system-cpu-time in UNIX?
...ed on the names, but what specifically are wall-clock-time, user-cpu-time, and system-cpu-time in UNIX?
4 Answers
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What are the big improvements between guava and apache equivalent libraries?
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First of, as javamonkey79 explained, while Google Guava and Apache Commons do share similar features, they also both have functionality that is absent from their counterpart. Thus, limiting yourself to only one library might be unwise.
That being said, if I had to choose, I'd opt...
Ruby: kind_of? vs. instance_of? vs. is_a?
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kind_of? and is_a? are synonymous.
instance_of? is different from the other two in that it only returns true if the object is an instance of that exact class, not a subclass.
Example:
"hello".is_a? Object and "hello".kind_of? Obje...
Regex exactly n OR m times
...ou are doing it is fine.
An alternative is:
X{m}(X{k})?
where m < n and k is the value of n-m.
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What does `:_*` (colon underscore star) do in Scala?
...Child - sequence
: - type ascription, a hint that helps compiler to understand, what type does that expression have
_* - placeholder accepting any value + vararg operator
child ++ newChild : _* expands Seq[Node] to Node* (tells the compiler that we're rather working with a varargs, than a sequence...
What does value & 0xff do in Java?
... not quite. The & operator works on long values as well, if either operand is a long. But not on byte. See the Java Language Specification, sections 15.22.1 and 5.6.2.
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How to pass an ArrayList to a varargs method parameter?
...r the whole function or you have to create the array in an additional step and suppress the warning on the variable you store it.
– Qw3ry
Jan 20 '17 at 10:31
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