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Grep characters before and after match?
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187
3 characters before and 4 characters after
$> echo "some123_string_and_another" | grep -o ...
Differences between “BEGIN RSA PRIVATE KEY” and “BEGIN PRIVATE KEY”
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189
See https://polarssl.org/kb/cryptography/asn1-key-structures-in-der-and-pem (search the page f...
Scala Doubles, and Precision
...e or round a Double? At one point in my code I would like a number like: 1.23456789 to be rounded to 1.23
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How to implement a queue using two stacks?
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710
Keep 2 stacks, let's call them inbox and outbox.
Enqueue:
Push the new element onto inbox
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Any reason not to use '+' to concatenate two strings?
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122
There is nothing wrong in concatenating two strings with +. Indeed it's easier to read than ''...
Safely limiting Ansible playbooks to a single machine?
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13 Answers
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How to convert an array of strings to an array of floats in numpy?
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181
Well, if you're reading the data in as a list, just do np.array(map(float, list_of_strings)) (...
Insert into a MySQL table or update if exists
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11 Answers
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undefined reference to boost::system::system_category() when compiling
I'm trying to compile a program on Ubuntu 11.10 that uses the Boost libraries. I have the 1.46-dev Boost libraries from the Ubuntu Repository installed, but I get an error when compiling the program.
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