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How to drop columns by name in a data frame
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389
You should use either indexing or the subset function. For example :
R> df <- data.fram...
Difference between Math.Floor() and Math.Truncate()
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edited May 23 '17 at 12:03
Community♦
111 silver badge
answered Aug 1 '08 at 12:26
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Append a NumPy array to a NumPy array
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234
In [1]: import numpy as np
In [2]: a = np.array([[1, 2, 3], [4, 5, 6]])
In [3]: b = np.array(...
How to apply a function to two columns of Pandas dataframe
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318
Here's an example using apply on the dataframe, which I am calling with axis = 1.
Note the d...
Image Segmentation using Mean Shift explained
...hood and whose value is within a distance d.
The Mean Shift takes usually 3 inputs:
A distance function for measuring distances between pixels. Usually the Euclidean distance, but any other well defined distance function could be used. The Manhattan
Distance is another useful choice sometimes.
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How to use pip with Python 3.x alongside Python 2.x
I installed Python 3.x (besides Python 2.x on Ubuntu) and slowly started to pair modules I use in Python 2.x.
10 Answers
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How do I get indices of N maximum values in a NumPy array?
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365
The simplest I've been able to come up with is:
In [1]: import numpy as np
In [2]: arr = np....
How to add an extra column to a NumPy array
...p.random.rand(N,N)
b = np.zeros((N,N+1))
b[:,:-1] = a
And timings:
In [23]: N = 10
In [24]: a = np.random.rand(N,N)
In [25]: %timeit b = np.hstack((a,np.zeros((a.shape[0],1))))
10000 loops, best of 3: 19.6 us per loop
In [27]: %timeit b = np.zeros((a.shape[0],a.shape[1]+1)); b[:,:-1] = a
10000...
How to update gradle in android studio?
...Official links
Version Compatibility
Migrate to Android Plugin for Gradle 3.0.0
Find out the latest version of Gradle
Info about the Gradle Wrapper
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Why does SIGPIPE exist?
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edited Oct 26 '16 at 9:13
Ton van den Heuvel
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