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How to create a CPU spike with a bash command
...l speed. Ideally, the CPU load would last a designated amount of time and then stop. I'm hoping there's some trick in bash. I'm thinking some sort of infinite loop.
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How to set Oracle's Java as the default Java in Ubuntu?
...em default Java just download the latest Java SE Development Kit from here then create a directory somewhere you like in your file system for example /usr/java now extract the files you just downloaded in that directory:
$ sudo tar xvzf jdk-8u5-linux-i586.tar.gz -C /usr/java
now to set your JAVA_...
What's the point of map in Haskell, when there is fmap?
... in Haskell 1.3. I.e., in Haskell 1.3 fmap was called map. This change was then reverted in Haskell 1.4 and fmap was introduced. The reason for this change was pedagogical; when teaching Haskell to beginners the very general type of map made error messages more difficult to understand. In my opinion...
How to get the separate digits of an int number?
... of printing to the console, we can collect it in an array of integers and then print the array:
public static void main(String[] args) {
Integer[] digits = getDigits(12345);
System.out.println(Arrays.toString(digits));
}
public static Integer[] getDigits(int num) {
List<Integer>...
How to remove frame from matplotlib (pyplot.figure vs matplotlib.figure ) (frameon=False Problematic
...t.box(False)
If you really must always use the object oriented approach, then do: ax.set_frame_on(False).
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What does (x ^ 0x1) != 0 mean?
...ression effectively means: if bit 0 of x is 0, or any other bit of x is 1, then the expression is true.
Conversely the expression is false if x == 1.
So the test is the same as:
if (x != 1)
and is therefore (arguably) unnecessarily obfuscated.
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PostgreSQL return result set as JSON array?
...) version of json_agg. You can either aggregate the rows into an array and then convert them:
SELECT to_jsonb(array_agg(t)) FROM t
or combine json_agg with a cast:
SELECT json_agg(t)::jsonb FROM t
My testing suggests that aggregating them into an array first is a little faster. I suspect that ...
Linux command (like cat) to read a specified quantity of characters
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@Miffy: Read the first 20 bytes with head, then use tail to get the last 10, eg: head -c 20 file | tail -c 10
– Dan
Apr 19 at 0:44
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Constructor in an Interface?
...es to provide a "base" class for implementations of the Message interface, then provide an AbstractMessage as well. Abstract classes shouldn't take the place of interfaces, was never attempting to suggest so.
– matt b
May 10 '10 at 16:17
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Where does Scala look for implicits?
...d m on an object o of a class C, and that class does not support method m, then Scala will look for an implicit conversion from C to something that does support m. A simple example would be the method map on String:
"abc".map(_.toInt)
String does not support the method map, but StringOps does, an...