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How to add a new row to an empty numpy array
...ack
arr = np.array([])
arr = np.hstack((arr, np.array([1,2,3])))
# arr is now [1,2,3]
arr = np.vstack((arr, np.array([4,5,6])))
# arr is now [[1,2,3],[4,5,6]]
You also can use the np.concatenate function.
Cheers
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...
Where and why do I have to put the “template” and “typename” keywords?
... my C++11 answer)
In order to parse a C++ program, the compiler needs to know whether certain names are types or not. The following example demonstrates that:
t * f;
How should this be parsed? For many languages a compiler doesn't need to know the meaning of a name in order to parse and basicall...
Setting DIV width and height in JavaScript
...e {
display:none;
}
.narrow {
display:block;
width:100px;
}
Now, I can easily just add and remove a class attribute, one single property, instead of calling multiple properties. In addition, when your Web designer wants to change the definition of what it means to be wide, he or she d...
Scala type programming resources
...]]]
(This is a lot like defining a val to be the result of a function.)
Now, suppose we want to define a value-level function def toInt[T <: Nat](v : T) which takes in an argument value, v, that conforms to Nat and returns an integer representing the natural number encoded in v's type. For exa...
Sorting object property by values
...ing exactly what you set out to do. That would work in all the browsers I know of, but it would be dependent on an implementation quirk, and could break at any time. You should never make assumptions about the order of elements in a JavaScript object.
var objSorted = {}
sortable.forEach(function(ite...
Pass Method as Parameter using C#
...
@unknown: In that case it would be Action instead of Func<string, int>.
– Jon Skeet
Jan 17 '10 at 21:45
...
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...
Selecting multiple columns in a pandas dataframe
I have data in different columns but I don't know how to extract it to save it in another variable.
18 Answers
...
/bin/sh: pushd: not found
...y my PS1 is (\u) \h:\w> but I just stripped it down to a generic string now for the answer. The prompt in DOS is also ending with > by default ($P$G IIRC), and I like that.
– hlovdal
Mar 4 '11 at 12:28
...
Create a tag in a GitHub repository
..., you might want to fetch it into your local repository too:
git fetch
Now next time, you may want to create one more tag within the same release from website. For that follow these steps:
Go to release tab
Click on edit button for the release
Provide name of the new tag ABC_DEF_V_5_3_T_2 and...