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Grouping functions (tapply, by, aggregate) and the *apply family
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+100
R has many *apply functions which are ably described in the help files (e.g. ?apply). There are enough of them, though, that beginni...
How to pass command line argument to gnuplot?
...c switch with a script that contains lines such as plot 'data' using 0:($1/100). gnuplot dies with the error invalid expression because $1 is disappeared. Where am I wrong? Note that without -c, the script runs succefully.
– lorcap
Sep 30 '15 at 15:43
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RESTful way to create multiple items in one request
...nd a POST to /api/books to create a book. But then when you want to create 100 books (in a single request as json), which URL would you post the collection of 100 books to? that's where the restlessness begins.
– code4kix
Oct 17 '18 at 13:54
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What does {0} mean when initializing an object?
...aggregate initializer also works:
SHELLEXECUTEINFO sexi = {};
char mytext[100] = {};
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Is std::vector copying the objects with a push_back?
...;Foo> FooPtr; Then make containers of FooPtrs
– pm100
Feb 16 '10 at 18:00
3
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How do I calculate percentiles with python/numpy?
...ze = len(data)
return sorted(data)[int(math.ceil((size * percentile) / 100)) - 1]
p5 = percentile(mylist, 5)
p25 = percentile(mylist, 25)
p50 = percentile(mylist, 50)
p75 = percentile(mylist, 75)
p95 = percentile(mylist, 95)
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jQuery - hashchange event
...ange will never fire, so its better to store hash and check it after every 100 millisecond whether its changed or not for all versions of IE.
if (("onhashchange" in window) && !($.browser.msie)) {
window.onhashchange = function () {
alert(window.location.hash);...
Concatenate a vector of strings/character
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And some benchmarks:
require(microbenchmark)
test <- stri_rand_lipsum(100)
microbenchmark(stri_paste(test, collapse=''), paste(test,collapse=''), do.call(paste, c(as.list(test), sep="")))
Unit: microseconds
expr min lq mean median uq ...
How to find the array index with a value?
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You can use indexOf:
var imageList = [100,200,300,400,500];
var index = imageList.indexOf(200); // 1
You will get -1 if it cannot find a value in the array.
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java : convert float to String and String to float
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Float to string - String.valueOf()
float amount=100.00f;
String strAmount=String.valueOf(amount);
// or Float.toString(float)
String to Float - Float.parseFloat()
String strAmount="100.20";
float amount=Float.parseFloat(strAmount)
// or Float.valueOf(string)
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