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When should you use a class vs a struct in C++?
...t has no non-static data members of type non-POD-struct, non-POD-union (or array of such types) or reference, and has no user-defined copy assignment operator and no user-defined destructor." There is no restriction on using the "struct" class-key and no restriction on using "public" (see 8.5.1/1 f...
Select rows of a matrix that meet a condition
...ction , and I personally find it useless.
I assume you have a data.frame, array, matrix called Mat with A, B, C as column names; then all you need to do is:
In the case of one condition on one column, lets say column A
Mat[which(Mat[,'A'] == 10), ]
In the case of multiple conditions on differ...
phantomjs not waiting for “full” page load
...gs[1];
page.viewportSize = {
width: 1280,
height: 720
};
var requestsArray = [];
page.onResourceRequested = function(requestData, networkRequest) {
requestsArray.push(requestData.id);
};
page.onResourceReceived = function(response) {
var index = requestsArray.indexOf(response.id);
if (...
How to check if a given directory exists in Ruby
...
File.exist?("directory")
Dir[] returns an array, so it will never be nil. If you want to do it your way, you could do
Dir["directory"].empty?
which will return true if it wasn't found.
sha...
Run PHP Task Asynchronously
...ask('/image/resize/filename/example.jpg'). The URL was first decoded to an array(module,controller,action,parameters), and then converted to JSON for injection to the queue itself.
A long running cli script then picked up the job from the queue, ran it (via Zend_Router_Simple), and if required, put...
Android List View Drag and Drop sort
...t your adapter and DynamicListView mush share the same instance if objects array. Otherwise implementation will not work. This is not a problem for static lists but may be a challenge with Loaders
– AAverin
Jan 12 '14 at 9:51
...
How to add title to subplots in Matplotlib?
... in Line 1 of code
and you can set its title inside a loop.
The rows of 2D array is length (len) of axis(ax)
Each row has 2 items i.e. It is list within a list (Point No.2)
set_title can be used to set title, once the proper axes(ax) or subplot is selected.
import matplotlib.pyplot as plt
fig...
What is the difference between 'E', 'T', and '?' for Java generics?
...ny non-primitive type you specify: any class type, any interface type, any array type, or even another type variable.
The most commonly used type parameter names are:
E - Element (used extensively by the Java Collections Framework)
K - Key
N - Number
T - Type
V - Value
In Java 7 it is permi...
How to get evaluated attributes inside a custom directive
...it can be handy to provide a declarative payload into your directive as an array or hash-object in the form:
my-directive-name="['string1', 'string2']"
In that case, you can cut to the chase and just use a nice basic angular.$eval(attr.attrName).
element.val("value = "+angular.$eval(attr.value)...
Select 50 items from list at random to write to file
...,23]
np.random.choice(mylist, 3, replace=False)
the function returns an array of 3 randomly chosen values from the list
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