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How to get subarray from array?
I have var ar = [1, 2, 3, 4, 5] and want some function getSubarray(array, fromIndex, toIndex) , that result of call getSubarray(ar, 1, 3) is new array [2, 3, 4] .
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Add a common Legend for combined ggplots
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108
Update 2015-Feb
See Steven's answer below
df1 <- read.table(text="group x y
gr...
Renaming columns in pandas
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1974
Just assign it to the .columns attribute:
>>> df = pd.DataFrame({'$a':[1,2], '$b': [...
Programmatically creating Markdown tables in R with KnitR
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122
Now knitr (since version 1.3) package include the kable function for a creation tables:
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What's the difference between a proc and a lambda in Ruby?
...e:
p = Proc.new {|a, b| puts a**2+b**2 } # => #<Proc:0x3c7d28@(irb):1>
p.call 1, 2 # => 5
p.call 1 # => NoMethodError: undefined method `**' for nil:NilClass
p.call 1, 2, 3 # => 5
l = lambda {|a, b| puts a**2+b**2 } # => #<Proc:0x15016c@(irb):5 (lambda)>
l.call 1, 2 # =&g...
How to convert a Binary String to a base 10 integer in Java
...without leading zeroes) that I want to convert to their corresponding base 10 numbers. Consider:
9 Answers
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Convert a list of data frames into one data frame
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148
Use bind_rows() from the dplyr package:
bind_rows(list_of_dataframes, .id = "column_label")
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How to group dataframe rows into list in pandas groupby?
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12 Answers
12
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how to convert from int to char*?
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129
In C++17, use std::to_chars as:
std::array<char, 10> str;
std::to_chars(str.data(), st...
Convert floats to ints in Pandas?
...mns=['a'])
df.a = df.a.astype(float)
df
Out[33]:
a
0 0.0000000
1 1.0000000
2 2.0000000
3 3.0000000
4 4.0000000
pd.options.display.float_format = '{:,.0f}'.format
df
Out[35]:
a
0 0
1 1
2 2
3 3
4 4
shar...