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Size of Matrix OpenCV
...size of the row can be greater than element size x cols. This is different from the issue of continuous Mat and is related to data alignment.
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“NODE_ENV” is not recognized as an internal or external command, operable command or batch file
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It sounds like your error comes from an attempt to run something like this (which works in Linux)
NODE_ENV=development node foo.js
the equivalent in Windows would be
SET NODE_ENV=development
node foo.js
running in the same command shell. You mentione...
Javascript Equivalent to PHP Explode()
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This is a direct conversion from your PHP code:
//Loading the variable
var mystr = '0000000020C90037:TEMP:data';
//Splitting it with : as the separator
var myarr = mystr.split(":");
//Then read the values from the array where 0 is the first
//Since w...
Facebook share button and custom text [closed]
...the link and facebook gets its Title + Description + Picture automatically from the page that you are sharing.
In order to "help" facebook API find those things you can put the following things in the header of the page that you are sharing:
<meta property="og:title" content="title" />
<...
Android: Clear the back stack
...te. This is especially useful,
for example, when launching an
activity from the notification
manager.
So your code to launch A would be:
Intent intent = new Intent(this, A.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);
Curren...
Why can't I declare static methods in an interface?
...atic methods are not instance dependent and hence can be executed straight from the class file. Given that all methods in an interface are abstract, the VM would have to look for a particular implementation of the interface in order to find the code behind the static method so that it could be execu...
How to join two sets in one line without using “|”
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You could use or_ alias:
>>> from operator import or_
>>> from functools import reduce # python3 required
>>> reduce(or_, [{1, 2, 3, 4}, {3, 4, 5, 6}])
set([1, 2, 3, 4, 5, 6])
...
Map.clear() vs new Map : Which one will be better? [duplicate]
... with new array. So, garbage collector should clear all the key and values from the previous map, and clear the reference to itself. So O(n) algorithm is executed anyway, but in the garbage collector thread. For 1000 records you won't see any difference.
BUT. The performance guide tells you that it...
Remove last character from string. Swift language
How can I remove last character from String variable using Swift? Can't find it in documentation.
22 Answers
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Are 2^n and n*2^n in the same time complexity?
...on. In computer science, it tends to mean base 2 because it mostly results from divide-and-conquer strategies. In big-O notation, it could represent anything, because the base-x logarithm of a number differs from its base-y logarithm by only a constant factor, regardless of x and y.
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