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This tip may be useful in the situations when you need to set the number of digits to print for the different columns in a matrix/data.frame to be outputted as a LaTeX table.
For example:

#install.packages("xtable") #library(xtable) tmp <- matrix(rnorm(9), 3, 3) xtmp <- xtable(tmp) digits(xtmp) <- c(0,0,3,4) print(xtmp, include.rownames = FALSE) # row names suppressed

See here for a nice gallery depicting a large variety of outputs you can produce using the xtable package.