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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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How to reset / remove chrome's input highlighting / focus border? [duplicate]
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You should be able to remove it using
outline: none;
but keep in mind this is potentially bad for usability: It will be hard to tell whether an element is focused, which can suck when you walk through all a form's elements using the Tab key - you should reflect somehow w...
How to pinch out in iOS simulator when map view is only a portion of the screen?
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Try double tapping with the "Option" key pressed. On the iPhone this causes the MKMapView to zoom out.
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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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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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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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UITableView didSelectRowAtIndexPath: not being called on first tap
... the first tap because you are not deselecting anything. Once you selected one row, when you try to select a second one, the first gets deselected.
– The dude
Sep 4 '14 at 13:30
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