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Getting the count of unique values in a column in bash
I have tab delimited files with several columns. I want to count the frequency of occurrence of the different values in a column for all the files in a folder and sort them in decreasing order of count (highest count first). How would I accomplish this in a Linux command line environment?
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What does the caret operator (^) in Python do?
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It's a bitwise XOR (exclusive OR).
It results to true if one (and only one) of the operands (evaluates to) true.
To demonstrate:
>>> 0^0
0
>>> 1^1
0
>>> 1^0
1
>>> 0^1
1
To explain one of your...
How do I split a multi-line string into multiple lines?
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edited Feb 26 at 11:52
Aryan Beezadhur
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answered O...
Convert character to ASCII code in JavaScript
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edited Feb 6 '17 at 12:11
answered Sep 18 '08 at 16:15
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How do you add an array to another array in Ruby and not end up with a multi-dimensional result?
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You've got a workable idea, but the #flatten! is in the wrong place -- it flattens its receiver, so you could use it to turn [1, 2, ['foo', 'bar']] into [1,2,'foo','bar'].
I'm doubtless forgetting some approaches, but you can concatenate:
a1...
Struct inheritance in C++
Can a struct be inherited in C++?
6 Answers
6
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querySelector search immediate children
... you should keep an eye on the W3C Selector API v.2 which is already available in most browser, both desktop and mobile, except IE (Edge seems to support): see full support list.
function(elem) {
return elem.querySelectorAll(':scope > someselector');
};
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How to show math equations in general github's markdown(not github's blog)
After investigating, I've found mathjax can do this. But when I write some example in my markdown file, it doesn't show the correct equations:
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Convert HTML to NSAttributedString in iOS
I am using a instance of UIWebView to process some text and color it correctly, it gives the result as HTML but rather than displaying it in the UIWebView I want to display it using Core Text with a NSAttributedString .
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Reference assignment operator in PHP, =&
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It's not deprecated and is unlikely to be. It's the standard way to, for example, make part of one array or object mirror changes made to another, instead of copying the existing data.
It's called assignment by reference, which, to quote the manual, "means that b...