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Remove duplicated rows using dplyr

...tion for this purpose. Original answer below: library(dplyr) set.seed(123) df <- data.frame( x = sample(0:1, 10, replace = T), y = sample(0:1, 10, replace = T), z = 1:10 ) One approach would be to group, and then only keep the first row: df %>% group_by(x, y) %>% filter(row_num...
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How do you do a ‘Pause’ with PowerShell 2.0?

... | edited Dec 27 '14 at 14:54 Peter Mortensen 26.5k2121 gold badges9292 silver badges122122 bronze badges ...
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How to split last commit into two in Git

...o that now it looks like this: 1 something something else something again 2 Now I decide that I want to split it into two, and I want the insertion of the first line to be in the first commit, and the insertion of the last line to be in the second commit. First I go back to HEAD's parent, but I ...
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Initializing a member array in constructor initializer

...tly to fire off list initialization struct A { int foo[3]; A():foo{1, 2, 3} { } A():foo({1, 2, 3}) { } /* invalid */ }; share | improve this answer | follow ...
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Javascript reduce() on Object

...plementation with that in mind: const add = { a: {value:1}, b: {value:2}, c: {value:3} } const total = Object.values(add).reduce((t, {value}) => t + value, 0) console.log(total) // 6 or simply: const add = { a: 1, b: 2, c: 3 } const total = Object.values(add).reduce((t, n) =&gt...
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Function for Factorial in Python

... 192 Easiest way is to use math.factorial (available in Python 2.6 and above): import math math.fact...
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How do I trim a file extension from a String in Java?

... 290 This is the sort of code that we shouldn't be doing ourselves. Use libraries for the mundane s...
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curl POST format for CURLOPT_POSTFIELDS

... | edited Mar 7 '11 at 20:40 answered Mar 7 '11 at 20:35 ...
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Google Gson - deserialize list object? (generic type)

... | edited Mar 20 '18 at 12:20 Daniel Pryden 52.7k1212 gold badges8787 silver badges128128 bronze badges ...
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How to get an object's properties in JavaScript / jQuery?

... 142 You can look up an object's keys and values by either invoking JavaScript's native for in loop: ...