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Concatenating two one-dimensional NumPy arrays
...e able to concatenate them using numpy.concatenate . But I get this error for the code below:
6 Answers
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How can we match a^n b^n with Java regex?
...nly write a Java regex pattern to match anbn. It uses a positive lookahead for assertion, and one nested reference for "counting".
Rather than immediately giving out the pattern, this answer will guide readers through the process of deriving it. Various hints are given as the solution is slowly cons...
iOS 7 status bar back to iOS 6 default style in iPhone app?
...ammatically in the traditional manner, or UIKit will update the appearance for you based on some new properties of UIViewController. The latter option is on by default. Check your app’s plist value for “ViewController-Based Status Bar Appearance” to see which one you’re using. If you set thi...
Rails Root directory path?
...
For super correctness, you should use:
Rails.root.join('foo','bar')
which will allow your app to work on platforms where / is not the directory separator, should anyone try and run it on one.
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What are the differences between numpy arrays and matrices? Which one should I use?
...ain advantage of numpy matrices is that they provide a convenient notation
for matrix multiplication: if a and b are matrices, then a*b is their matrix
product.
import numpy as np
a = np.mat('4 3; 2 1')
b = np.mat('1 2; 3 4')
print(a)
# [[4 3]
# [2 1]]
print(b)
# [[1 2]
# [3 4]]
print(a*b)
# [[1...
ASP.NET MVC - Attaching an entity of type 'MODELNAME' failed because another entity of the same type
...POSTing wrapper model and changing the state of one entry to 'Modified'. Before changing the state, the state is set to 'Detached' but calling Attach() does throw the same error. I'm using EF6.
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Pandas percentage of total with groupby
... 'sales': [np.random.randint(100000, 999999)
for _ in range(12)]})
state_office = df.groupby(['state', 'office_id']).agg({'sales': 'sum'})
# Change: groupby state_office and divide by sum
state_pcts = state_office.groupby(level=0).apply(lambda x:
...
Linux - Replacing spaces in the file names
...
This should do it:
for file in *; do mv "$file" `echo $file | tr ' ' '_'` ; done
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ImportError: numpy.core.multiarray failed to import
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Was in the exact same condition... For me the issue was dual installation of numpy which was in a conflicting version with other libraries and it was shadowing the correct numpy version installed by conda. Solution: pip uninstall numpy ... this removed the f...
PHP $_SERVER['HTTP_HOST'] vs. $_SERVER['SERVER_NAME'], am I understanding the man pages correctly?
... read the PHP $_SERVER docs . Do I have this right regarding which to use for my PHP scripts for simple link definitions used throughout my site?
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