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Specifying rails version to use when creating a new application
I have two versions of rails (2.1.0 and 2.2.2) installed in my computer.
7 Answers
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How are multi-dimensional arrays formatted in memory?
...ch makes everything line up nicely. You do have to be careful with static 2D arrays like you mention, since if you try to pass one to a function taking an int ** parameter, bad things are going to happen. Here's a quick example:
int array1[3][2] = {{0, 1}, {2, 3}, {4, 5}};
In memory looks like ...
How to select rows with one or more nulls from a pandas DataFrame without listing columns explicitly
...p.NaN], range(3), range(3)])
>>> df.isnull()
0 1 2
0 False False False
1 False True False
2 False False True
3 False False False
4 False False False
>>> df.isnull().any(axis=1)
0 False
1 True
2 True
3 False
4 False
dtype: bool
>...
How to set versionName in APK filename using gradle?
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229
I only have to change the version name in one place. The code is simple too.
The examples belo...
Common elements comparison between 2 lists
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282
>>> list1 = [1,2,3,4,5,6]
>>> list2 = [3, 5, 7, 9]
>>> list(set(lis...
Sample random rows in dataframe
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First make some data:
> df = data.frame(matrix(rnorm(20), nrow=10))
> df
X1 X2
1 0.7091409 -1.4061361
2 -1.1334614 -0.1973846
3 2.3343391 -0.4385071
4 -0.9040278 -0.6593677
5 0.4180331 -1.2592415
6 0.7572246 -0.5463655
7 -0.8996483 0.4231117
8 ...
App Inventor 2 数学代码块 · App Inventor 2 中文网
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Is there an equivalent for the Zip function in Clojure Core or Contrib?
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220
(map vector '(1 2 3) '(4 5 6))
does what you want:
=> ([1 4] [2 5] [3 6])
Haskell need...
How can I create a two dimensional array in JavaScript?
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Format number to 2 decimal places
I would like to know how can I output a number with 2 decimal places, without rounding the original number.
6 Answers
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