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Best way to merge two maps and sum the values of same key?
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15 Answers
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Passing parameters to JavaScript files
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14 Answers
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Relative frequencies / proportions with dplyr
...se(n = n()) %>%
mutate(freq = n / sum(n))
# am gear n freq
# 1 0 3 15 0.7894737
# 2 0 4 4 0.2105263
# 3 1 4 8 0.6153846
# 4 1 5 5 0.3846154
From the dplyr vignette:
When you group by multiple variables, each summary peels off one level of the grouping. That mak...
CSS3 Transparency + Gradient
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edited Jun 16 '12 at 16:08
umassthrower
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How to perform element-wise multiplication of two lists?
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14 Answers
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use Winmerge inside of Git to file diff
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113
Update June 2015, 6 years later:
As detailed in "git mergetool winmerge", a simple git config...
Checking images for similarity with OpenCV
...lue (maybe a percentage) that indicates how similar these images are? E.g. 100% would be returned if the same image was passed twice, 0% would be returned if the images were totally different.
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jQuery attr vs prop?
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71
Unfortunately none of your links work :(
Some insight though, attr is for all attributes. prop i...
Find integer index of rows with NaN in pandas dataframe
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11 Answers
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Minimum and maximum date
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From the spec, §15.9.1.1:
A Date object contains a Number indicating a particular instant in...