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Designing function f(f(n)) == -n
...sitive integer will overflow, so it will work for all integers except that one.
To make it work for real numbers you need to replace the n in (-1)n with { ceiling(n) if n>0; floor(n) if n<0 }.
In C# (works for any double, except in overflow situations):
static double F(double n)
{
if ...
How to make an Android device vibrate?
...(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
v.vibrate(VibrationEffect.createOneShot(500, VibrationEffect.DEFAULT_AMPLITUDE));
} else {
//deprecated in API 26
v.vibrate(500);
}
Note:
Don't forget to include permission in AndroidManifest.xml file:
<uses-permission andro...
Which Java Collection should I use?
...
Since I couldn't find a similar flowchart I decided to make one myself.
This flow chart does not try and cover things like synchronized access, thread safety etc or the legacy collections, but it does cover the 3 standard Sets, 3 standard Maps and 2 standard Lists.
This image was ...
What do hjust and vjust do when making a plot using ggplot?
...described there are how it works in geom_text and theme_text (sometimes). One way to think of it is to think of a box around the text, and where the reference point is in relation to that box, in units relative to the size of the box (and thus different for texts of different size). An hjust of 0....
Can I use view pager with views (not with fragments)
...
nice one.. help me a lot... i extended PageAdapter instead of FragmentPageAdapter........ now its work fine.....
– ranjith
Sep 10 '13 at 4:39
...
When should I use RequestFactory vs GWT-RPC?
...by the client code in a Proxy interface, and the RequestFactory server components take care of marshaling the data and invoking your service methods. For applications that have a well-defined concept of "Entities" or "Objects with identity and version", the EntityProxy type is used to expose the pe...
How to redirect all HTTP requests to HTTPS
...as issues for me on certain URLs. For example, http://server/foo?email=someone%40example.com redirects to https://server/foo?email=someone%2540example.com i.e. the "@" sign gets URL-quoted twice. Using the method in @ssc's answer does not have this issue.
– psmears
...
How do I merge changes to a single file, rather than merging commits?
...l merge all of your changes, but we are only using this branch to grab the one file.
Fix up any Conflicts etc. investigate your file.
checkout your working branch
Checkout the file commited from your merge.
Commit it.
I tried patching and my situation was too ugly for it. So in short it would loo...
When should I use Debug.Assert()?
...uild your project in Release mode, all validations/error-checking will be gone.
– Oscar Mederos
May 7 '11 at 8:31
28
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Ruby: Can I write multi-line string with no concatenation?
...eeded (easy multi-line concatenation WITHOUT extra whitespace), but since none of the actual answers had it, I'm compiling them here:
str = 'this is a multi-line string'\
' using implicit concatenation'\
' to prevent spare \n\'s'
=> "this is a multi-line string using implicit concatenation ...