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How to make a flat list out of list of lists?
...f lists l,
flat_list = [item for sublist in l for item in sublist]
which means:
flat_list = []
for sublist in l:
for item in sublist:
flat_list.append(item)
is faster than the shortcuts posted so far. (l is the list to flatten.)
Here is the corresponding function:
flatten = lambda...
Find row where values for column is maximal in a pandas DataFrame
...ort pandas
>>> import numpy as np
>>> df = pandas.DataFrame(np.random.randn(5,3),columns=['A','B','C'])
>>> df
A B C
0 1.232853 -1.979459 -0.573626
1 0.140767 0.394940 1.068890
2 0.742023 1.343977 -0.579745
3 2.125299 -0.649328 -0.211692
4 ...
Setting individual axis limits with facet_wrap and scales = “free” in ggplot2
... help explore the results of modeling efforts using different training parameters. I train the model with 85% of the data, test on the remaining 15%, and repeat this 5 times, collecting actual/predicted values each time. After calculating the residuals, my data.frame looks like this:
...
What's so bad about in-line CSS?
...website starter code and examples, the CSS is always in a separate file, named something like "main.css", "default.css", or "Site.css". However, when I'm coding up a page, I'm often tempted to throw the CSS in-line with a DOM element, such as by setting "float: right" on an image. I get the feeling ...
String's Maximum length in Java - calling length() method
...s the maximum size a String object may have, referring to the length() method call?
7 Answers
...
How can I add a key/value pair to a JavaScript object?
...ion:
obj["key3"] = "value3";
The first form is used when you know the name of the property. The second form is used when the name of the property is dynamically determined. Like in this example:
var getProperty = function (propertyName) {
return obj[propertyName];
};
getProperty("key1");
ge...
Orchestration vs. Choreography
...
Basic technologies such as (XML, SOAP, WSDL) provide means to describe, locate, and invoke services as an entity in its own right. However, these technologies do not give a rich behavioral detail about the role of the service in more complex collaboration. This collaboration in...
Is it Linq or Lambda?
...re item.Value == 1
select item;
This is also LINQ (using method syntax):
var _Results = _List.Where(x => x.Value == 1);
It's interesting to note that both of these flavors will end up producing the exact same code. The compiler offers you a service by allowing you to express ...
How to fix error with xml2-config not found when installing PHP from sources?
...
I'm using centos 6.4, for me the package was called libxml2-devel
– msknapp
May 17 '14 at 19:27
5
...
How to implement a tree data-structure in Java? [closed]
...hat can be used for String or any other object. It is fairly easy to implement simple trees to do what you need.
All you need to add are methods for add to, removing from, traversing, and constructors. The Node is the basic building block of the Tree.
...