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count the frequency that a value occurs in a dataframe column
...['freq'] = df.groupby('a')['a'].transform('count')
df
Out[41]:
a freq
0 a 2
1 b 3
2 s 2
3 s 2
4 b 3
5 a 2
6 b 3
[7 rows x 2 columns]
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How to filter multiple values (OR operation) in angularJS
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Add a prefix string to beginning of each line
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PhysicalChemist
50444 silver badges1313 bronze badges
answered Jan 20 '10 at 6:38
Alok SinghalAlok Singhal
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How does the bitwise complement operator (~ tilde) work?
...ple, here's the representation of -2 in two's complement: (8 bits)
1111 1110
The way you get this is by taking the binary representation of a number, taking its complement (inverting all the bits) and adding one. Two starts as 0000 0010, and by inverting the bits we get 1111 1101. Adding one gets u...
How to remove text from a string?
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edited Feb 28 at 9:20
Community♦
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answered May 1 '12 at 14:14
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Add an element to an array in Swift
...o insert a new element into your Array.
anArray.insert("This String", at: 0)
To insert the contents of a different Array into your Array.
anArray.insert(contentsOf: ["Moar", "Strings"], at: 0)
More information can be found in the "Collection Types" chapter of "The Swift Programming Language", ...
Peak detection in a 2D array
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+500
I detected the peaks using a local maximum filter. Here is the result on your first dataset of 4 paws:
I also ran it on the second ...
Show Youtube video source into HTML5 video tag?
...irplay="allow"
data-youtube-id="N9oxmRT2YWw"
src="http://v20.lscache8.c.youtube.com/videoplayback?sparams=id%2Cexpire%2Cip%2Cipbits%2Citag%2Cratebypass%2Coc%3AU0hPRVRMVV9FSkNOOV9MRllD&itag=43&ipbits=0&signature=D2BCBE2F115E68C5FF97673F1D797F3C3E3BFB99.59252109...
Dynamically load JS inside JS [duplicate]
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kayenkayen
4,27033 gold badges1616 silver badges2020 bronze badges
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Convert json data to a html table [closed]
...uses jQuery.
Code snippet:
var myList = [
{ "name": "abc", "age": 50 },
{ "age": "25", "hobby": "swimming" },
{ "name": "xyz", "hobby": "programming" }
];
// Builds the HTML Table out of myList.
function buildHtmlTable(selector) {
var columns = addAllColumnHeaders(myList, selec...
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