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How to insert element into arrays at specific position?
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214
array_slice() can be used to extract parts of the array, and the union array operator (+) can r...
Difference between map, applymap and apply methods in Pandas
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10 Answers
10
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How do I sort one vector based on values of another
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edited Oct 15 '09 at 0:31
answered Oct 14 '09 at 21:47
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How to calculate cumulative normal distribution?
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125
Here's an example:
>>> from scipy.stats import norm
>>> norm.cdf(1.96)
0.97...
mongodb group values by multiple fields
...dr",
"book": "$book"
},
"bookCount": { "$sum": 1 }
}},
{ "$group": {
"_id": "$_id.addr",
"books": {
"$push": {
"book": "$_id.book",
"count": "$bookCount"
},
},
"count": { "$s...
Boolean operators && and ||
...an return a vector, like this:
((-2:2) >= 0) & ((-2:2) <= 0)
# [1] FALSE FALSE TRUE FALSE FALSE
The longer form evaluates left to right examining only the first element of each vector, so the above gives
((-2:2) >= 0) && ((-2:2) <= 0)
# [1] FALSE
As the help page says...
How can I verify if one list is a subset of another?
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15 Answers
15
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How can I create a two dimensional array in JavaScript?
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