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How can I get summary in scientific format

debugcn 投稿 Dev
8
maximusyoda

I am getting the mean, max and min of a column a by factors b

tapply(df$a,df$b,summary)

However, I want to have the numbers in Scientific format. e.g. 4.42e+03

How can I do it?

keegan 
format(tapply(mtcars$mpg,mtcars$cyl,summary),scientific=TRUE)

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