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How to convert a data frame column to numeric type?
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277
Since (still) nobody got check-mark, I assume that you have some practical issue in mind, most...
How to turn NaN from parseInt into 0 for an empty string?
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edited Dec 2 '19 at 20:44
isherwood
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Reusable library to get human readable version of file size?
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22 Answers
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MySQL foreign key constraints, cascade delete
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392
If your cascading deletes nuke a product because it was a member of a category that was killed, ...
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How to return 2 values from a Java method?
I am trying to return 2 values from a Java method but I get these errors. Here is my code:
14 Answers
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Creating a custom JButton in Java
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edited Oct 27 '16 at 7:19
Lahiru Ashan
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answered Aug...
Combine two or more columns in a dataframe into a new column with a new name
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132
Use paste.
df$x <- paste(df$n,df$s)
df
# n s b x
# 1 2 aa TRUE 2 aa
# 2 3 bb F...