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Difference between `set`, `setq`, and `setf` in Common Lisp?
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Originally, in Lisp, there were no lexical variables -- only dynamic ones. And
there was no SETQ or SETF, just the SET function.
What is now written as:
(setf (symbol-value '*foo*) 42)
was written as:
(set (quote *foo*) 42)
which was eventually abbreviavated to SETQ (SET Quoted):
(setq...
MySQL “Group By” and “Order By”
...clauses will only apply to the returned column value, not to the discarded ones.
IMPORTANT UPDATE
Selecting non-aggregate columns used to work in practice but should not be relied upon. Per the MySQL documentation "this is useful primarily when all values in each nonaggregated column not named in th...
Padding is invalid and cannot be removed?
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Thank you I found it rj.Padding=PaddingMode.none; :)
– Ahmad Hajjar
Jan 11 '12 at 7:19
7
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XSD - how to allow elements in any order any number of times?
...s. So this sounds like what you are looking for.
Edit: if you wanted only one of them to appear an unlimited number of times, the unbounded would have to go on the elements instead:
Edit: Fixed type in XML.
Edit: Capitalised O in maxOccurs
<xs:element name="foo">
<xs:complexType>
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Add directives from directive in AngularJS
...Higher numbers run first. The default priority is 0 if you don’t specify one.
EDIT: after the discussion, here's the complete working solution. The key was to remove the attribute: element.removeAttr("common-things");, and also element.removeAttr("data-common-things"); (in case users specify data...
How do you pass arguments to define_method?
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end
end
a = Bar.new
a.foo :one, 'two', :three, 4, 5 do
'six'
end
Update
Ruby 2.0 introduced double splat ** (two stars) which (I quote) does:
Ruby 2.0 introduced keyword arguments, and ** acts like *, but for keyword arguments. It returns a...
Copying PostgreSQL database to another server
...irst command in this answer is to copy from local to remote and the second one is from remote to local. More -> https://www.postgresql.org/docs/9.6/app-pgdump.html
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Java's final vs. C++'s const
...y must be set before the constructor has finished, this can be achieved in one of two ways:
public class Foo {
private final int a;
private final int b = 11;
public Foo() {
a = 10;
}
}
In C++ you will need to use initialisation lists to give const members a value:
class Foo {
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Remove rows with duplicate indices (Pandas DataFrame and TimeSeries)
...es and are compiled into monthly files for each weather station. Once I'm done parsing a file, the DataFrame looks something like this:
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How do I choose grid and block dimensions for CUDA kernels?
...e CUDA grid, block and thread sizes. This is an additional question to the one posted here .
3 Answers
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