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How to use chrome web inspector to view hover code
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Now you can see both the pseudo-class style rules and force them on elements.
To see the rules like :hover in the Styles pane click the small dotted box button in the top right.
To force an element into :hover state, rig...
List comprehension: Returning two (or more) items for each item
... @khachik I think this would be faster but I will time both methods now, tuples are generated very fast in python though.
– jamylak
Aug 8 '12 at 16:41
3
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Why is lazy evaluation useful?
...ort (filter (< x) xs) ++ [x] ++ quickSort (filter (>= x) xs)
If we now want to find the minimum of the list, we can define
minimum ls = head (quickSort ls)
Which first sorts the list and then takes the first element of the list. However, because of lazy evaluation, only the head gets comp...
Control the size of points in an R scatterplot?
...mis-apply that rule then not only is your symbol size not changed, but you now have multiple parameters affecting text size (cex.axis, cex.lab, cex.main, and cex.sub--all do the same job as 'cex', only piece-wise). Code like that is difficult to maintain and extend.
– doug
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C++ Double Address Operator? (&&)
...meter of a function. And it only takes a r-value expression. If you don't know what an r-value is, the simple explanation is that it doesn't have a memory address. E.g. the number 6, and character 'v' are both r-values. int a, a is an l-value, however (a+2) is an r-value. For example:
void foo(int&...
Android customized button; changing text color
...ered Jun 28 '17 at 5:35
SeekingKnowlegesSeekingKnowleges
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When should I use double instead of decimal?
..., try reading the oft-quoted article What Every Computer Scientist Should Know About Floating-Point Arithmetic.
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How to read XML using XPath in Java
...ith this code:
expr.evaluate(doc, XPathConstants.STRING);
If you don't know how many URLs are in a given node, then you should rather do something like this:
XPathExpression expr = xpath.compile("/howto/topic[@name='PowerBuilder']/url");
NodeList nl = (NodeList) expr.evaluate(doc, XPathConstants...
.gitignore file, where should I put it in my xcode project?
...ory and activate it:
git config --global core.excludesfile ~/.gitignore
Now you can put whatever files are generated by your development tools into your .gitignore file.
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Which data type for latitude and longitude?
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If you do not need all the functionality PostGIS offers, Postgres (nowadays) offers an extension module called earthdistance. It uses the point or cube data type depending on your accuracy needs for distance calculations.
You can now use the earth_box function to -for example- query for poi...