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How to get unique values in an array
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120
Since I went on about it in the comments for @Rocket's answer, I may as well provide an exampl...
App Inventor 2 云数据库配置教程 - Firebase/云数据库1/自建后台 · App Inventor 2 中文网
... App Inventor 2 云数据库配置教程 - Firebase/云数据库1/自建后台
App Inventor 2 云数据库配置教程 - Firebase/云数据库1/自建后台
一、云存储方案对比
二、云数据库1 —— MIT官方云数据...
How to print a percentage value in python?
...entage floating point precision type:
>>> print "{0:.0%}".format(1./3)
33%
If you don't want integer division, you can import Python3's division from __future__:
>>> from __future__ import division
>>> 1 / 3
0.3333333333333333
# The above 33% example would could now b...
Redirect STDERR / STDOUT of a process AFTER it's been started, using command line?
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126
Short of closing and reopening your tty (i.e. logging off and back on, which may also terminat...
Efficient way to insert a number into a sorted array of numbers?
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15 Answers
15
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What would cause an algorithm to have O(log n) complexity?
...ere are a few:
Repeatedly dividing by a constant
Take any number n; say, 16. How many times can you divide n by two before you get a number less than or equal to one? For 16, we have that
16 / 2 = 8
8 / 2 = 4
4 / 2 = 2
2 / 2 = 1
Notice that this ends up taking four steps to complete. Inte...
How do I calculate percentiles with python/numpy?
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11 Answers
11
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Is there a way to 'uniq' by column?
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sort -u -t, -k1,1 file
-u for unique
-t, so comma is the delimiter
-k1,1 for the key field 1
Test result:
overflow@domain2.com,2009-11-27 00:58:29.793000000,xx3.net,255.255.255.0
stack2@domain.com,2009-11-27 01:05:47.893000000,xx2.n...
Add new row to dataframe, at specific row-index, not appended?
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159
Here's a solution that avoids the (often slow) rbind call:
existingDF <- as.data.frame(mat...