How to calculate standard deviation of a table in R? -

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i have table of data looks this:

category : solution 1 : solution 2 : diff 1: 5 : 6 : -1 2: 7 : 6 : 1 3: 4 : 4 : 0 4: 8 : 9 : -1

how calculate standard deviation within r?

sd(d$diff) should give standard deviation of column

to standard deviation of columns 

apply(d,2,sd)

where d data frame.


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