dataframe - How to save the result of R apply functions into a matrix? -


suppose have data set x, has dimension 100 x 10. want apply set of functions each column, , save results in new data frame same column headers.

example

m <- matrix(rexp(200, rate=.1), ncol=20) m_df <- as.data.frame(m) row1 <- apply(m_df,2,mean) row2 <- apply(m_df,2,var) row3 <- apply(m_df,2,sum)

i want make new matrix comprised of row1, row2, , row3 has same column headers m_df.

thanks! max

try this:

apply(m_df,2,function(x) c(mean = mean(x),var = var(x),sum = sum(x)))

although, keep in mind first thing apply convert m_df matrix, there's not point in converting data frame before have to.


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