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How to access random item in list?
I have an ArrayList, and I need to be able to click a button and then randomly pick out a string from that list and display it in a messagebox.
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Numpy how to iterate over columns of array?
Suppose I have and m x n array. I want to pass each column of this array to a function to perform some operation on the entire column. How do I iterate over the columns of the array?
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Getting all selected checkboxes in an array
...rmatted :
$("input:checkbox[name=type]:checked").each(function(){
yourArray.push($(this).val());
});
Hopefully, it will work.
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How do I convert a numpy array to (and display) an image?
I have created an array thusly:
9 Answers
9
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How can I measure the speed of code written in PHP? [closed]
...ething like this, so, if you want to know how long it take to serialize an array :
$before = microtime(true);
for ($i=0 ; $i<100000 ; $i++) {
serialize($list);
}
$after = microtime(true);
echo ($after-$before)/$i . " sec/serialize\n";
Not perfect, but useful, and it doesn't take much tim...
Easy interview question got harder: given numbers 1..100, find the missing number(s) given exactly k
...there works here too.
Assuming that the "bag" is represented by a 1-based array A[] of size N - k, we can solve Qk in O(N) time and O(k) additional space.
First, we extend our array A[] by k elements, so that it is now of size N. This is the O(k) additional space. We then run the following pseud...
Which Java Collection should I use?
...led discussion of when to use HashSet or TreeSet here:
Hashset vs Treeset
ArrayList vs LinkedList
Detailed discussion: When to use LinkedList over ArrayList?
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Ruby: How to turn a hash into HTTP parameters?
...ing Ruby 1.9.2 or later, you can use URI.encode_www_form if you don't need arrays.
E.g. (from the Ruby docs in 1.9.3):
URI.encode_www_form([["q", "ruby"], ["lang", "en"]])
#=> "q=ruby&lang=en"
URI.encode_www_form("q" => "ruby", "lang" => "en")
#=> "q=ruby&lang=en"
URI.encode_ww...
How to initialize HashSet values by construction?
...ent, but fits on a single line:
Set<String> h = new HashSet<>(Arrays.asList("a", "b"));
Again, this is not time efficient since you are constructing an array, converting to a list and using that list to create a set.
When initializing static final sets I usually write it like this:
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Cost of len() function
...t - very fast) on every type you've mentioned, plus set and others such as array.array.
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