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How do you calculate log base 2 in Java for integers?
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10 Answers
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Object.getOwnPropertyNames vs Object.keys
...ar a = {};
Object.defineProperties(a, {
one: {enumerable: true, value: 1},
two: {enumerable: false, value: 2},
});
Object.keys(a); // ["one"]
Object.getOwnPropertyNames(a); // ["one", "two"]
If you define a property without providing property attributes descriptor (meaning you don't use Obj...
How to change the DataTable Column Name?
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edited Jun 21 '11 at 1:11
answered Jun 20 '11 at 5:47
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Matplotlib: “Unknown projection '3d'” error
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114
First off, I think mplot3D worked a bit differently in matplotlib version 0.99 than it does in...
Strange \n in base64 encoded string in Ruby
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edited Aug 26 '19 at 19:29
answered Apr 12 '10 at 9:38
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NumPy: function for simultaneous max() and min()
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12 Answers
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How do you delete a column by name in data.table?
...of the following will remove column foo from the data.table df3:
# Method 1 (and preferred as it takes 0.00s even on a 20GB data.table)
df3[,foo:=NULL]
df3[, c("foo","bar"):=NULL] # remove two columns
myVar = "foo"
df3[, (myVar):=NULL] # lookup myVar contents
# Method 2a -- A safe idiom for e...
Is there a method that calculates a factorial in Java?
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answered May 21 '09 at 1:45
Karl the PaganKarl the Pagan
1,8351717 silver badges1717 bronze badges
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python pandas: Remove duplicates by columns A, keeping the row with the highest value in column B
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