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How do you round a float to two decimal places in jruby
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edited May 23 '17 at 12:18
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answered May 5 '12 at 16:06
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Breaking loop when “warnings()” appear in R
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152
You can turn warnings into errors with:
options(warn=2)
Unlike warnings, errors will interrup...
Get item in the list in Scala?
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Use parentheses:
data(2)
But you don't really want to do that with lists very often, since linked lists take time to traverse. If you want to index into a collection, use Vector (immutable) or ArrayBuffer (mutable) or possibly Array (which is j...
What does value & 0xff do in Java?
... a long. But not on byte. See the Java Language Specification, sections 15.22.1 and 5.6.2.
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Class with Object as a parameter
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In Python2 this declares Table to be a new-style class (as opposed to "classic" class).
In Python3 all classes are new-style classes, so this is no longer necessary.
New style classes have a few special attributes that classic classe...
in_array multiple values
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200
Intersect the targets with the haystack and make sure the intersection is precisely equal to t...
MySQL - ORDER BY values within IN()
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SELECT id, name
FROM mytable
WHERE name IN ('B', 'A', 'D', 'E', 'C')
ORDER BY FIELD(name, 'B',...
Running multiple commands in one line in shell
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824
You are using | (pipe) to direct the output of a command into another command. What you are loo...
Append a NumPy array to a NumPy array
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234
In [1]: import numpy as np
In [2]: a = np.array([[1, 2, 3], [4, 5, 6]])
In [3]: b = np.array...
Android:What is difference between setFlags and addFlags for intent
... flags look like this: 1, 10, 100, 1000, etc... (which in this case are 1, 2, 4, 8). So, what addFlags does is appending the integer you pass using the | operator.
// example...
// value of flags: 1
intent.setFlags(2|4);
// now flags have this value: 110
intent.addFlags(8);
// now flags have thi...