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How do you downgrade rubygems?
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Updated November 2011: Now that RVM's out, try running rvm install rubygems <version>.
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How to get year, month, day, hours, minutes, seconds and milliseconds of the current moment in Java?
...You can use the getters of java.time.LocalDateTime for that.
LocalDateTime now = LocalDateTime.now();
int year = now.getYear();
int month = now.getMonthValue();
int day = now.getDayOfMonth();
int hour = now.getHour();
int minute = now.getMinute();
int second = now.getSecond();
int millis = now.get(C...
Visual Studio debugging “quick watch” tool and lambda expressions
...e function Example is run in the debugger it will stop at the Break line. Now imagine if the user typed the following into the watch window
(Func<int>)(() => v2);
In order to properly execute this the debugger (or more appropriate the EE) would need to create a closure for variable v2. ...
Label encoding across multiple columns in scikit-learn
...commended way is
OneHotEncoder().fit_transform(df)
as the OneHotEncoder now supports string input.
Applying OneHotEncoder only to certain columns is possible with the ColumnTransformer.
EDIT:
Since this answer is over a year ago, and generated many upvotes (including a bounty), I should probabl...
Differences in boolean operators: & vs && and | vs ||
I know the rules for && and || but what are & and | ? Please explain these to me with an example.
11 Ans...
How can I find out if I have Xcode commandline tools installed?
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if you want to know the install version of Xcode as well as Swift
language current version:
Use below simple command by using Terminal:
1. To get install Xcode Version
xcodebuild -version
2. To get install Swift language Version
sw...
MySQL Select minimum/maximum among two (or more) given values
... watch out if NULL is likely to be in a field value ...
SELECT LEAST(NULL,NOW());
and
SELECT GREATEST(NULL,NOW());
both return null, which may not be what you want (especially in the case of GREATEST)
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Convert pandas dataframe to NumPy array
I am interested in knowing how to convert a pandas dataframe into a NumPy array.
15 Answers
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Eclipse: Exclude specific packages when autocompleting a class name
...Explorer and Hierarchy views.
finnw (the OP) adds in the comments:
Now how do you add a single class to this list? I'm not interested in java.awt.List but occasionally I want java.awt.Window or java.awt.Dimension. –
"Type filter" is actually based on class pattern matching, meaning if yo...
JavaScript checking for null vs. undefined and difference between == and ===
...gain, note that the last one is vague; it will also be true if a is null.
Now, despite the above, the usual way to check for those is to use the fact that they're falsey:
if (!a) {
// `a` is falsey, which includes `undefined` and `null`
// (and `""`, and `0`, and `NaN`, and [of course] `f...