[R] compute variance of every column in a matrix without a loop

Jonathan Baron baron at cattell.psych.upenn.edu
Sun Mar 17 12:57:30 CET 2002

On 03/16/02 19:43, Francisco J Molina wrote:
>Is it possible to compute the variance of every column in a matrix
>without a loop?

If the matrix is m1,


or, with missing data,


In general, apply() and related functions are well worth
Jonathan Baron, Professor of Psychology, University of Pennsylvania
Home page: http://www.sas.upenn.edu/~baron
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