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How to add an extra column to a NumPy array
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I think a more straightforward solution and faster to boot is to do the following:
import numpy as np
N = 10
a = np.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.hstac...
Postgresql: password authentication failed for user “postgres”
I have installed PostgreSQL 8.4, Postgres client and Pgadmin 3. Authentication failed for user "postgres" for both console client and Pgadmin. I have typed user as "postgres" and password "postgres", because it worked before. But now authentication is failed. I did it before a couple of times withou...
Escaping ampersand in URL
I am trying to send a GET message that contains strings with ampersands and can't figure how to escape the ampersand in the URL.
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What's the difference between IQueryable and IEnumerable
...ry IEnumerables using the Linq extensions. So what is this IQueryable and how does it differ?
7 Answers
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How to manually send HTTP POST requests from Firefox or Chrome browser?
... documenting our own API here.
Postman now also has native apps (i.e. standalone) for Windows, Mac and Linux! It is more preferable now to use native apps, read more here.
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Random Number Between 2 Double Numbers
Is it possible to generate a random number between 2 doubles?
12 Answers
12
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How to show all parents and subclasses of a class in IntelliJ IDEA?
...s variable, I can do Ctrl + T to have a popup that shows all its parents and subclasses. What is the equivalent in IntelliJ?
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How to sort the letters in a string alphabetically in Python
...join() (see askewchan answer's below).
– Skippy le Grand Gourou
Jan 12 '19 at 10:12
Note that ''.join(sorted(a, revers...
Is it possible to have multiple statements in a python lambda expression?
...s a version of sort that creates a new list, rather than sorting in-place, and can be chained. Note that this is probably what you should be using - it's bad practice for your map to have side effects on the original list.
Q. How should I get the second lowest item from each list in a sequence of ...
Get the client's IP address in socket.io
...t the IP address of an incoming connection? I know you can get it from a standard HTTP connection, but socket.io is a bit of a different beast.
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