Understanding apply function in R -

Understanding apply function in R -

in r, i've come across utilize of apply function. have looked @ documentation, want create sure understand correctly.

in following, z n*t matrix.

> x <- apply(z, 1, var)

this code generates vector of dimension n*1, element in x variance of i'th row of z. correct?

this have been written for-loop. how look?

let's m matrix

the apply function this

for(i in 1:nrow(m)){function(m[i,])}

where function can var (as in example) or function.

if take sec argument 2 instead of 1, apply same work on columns :

for(i in 1:ncol(m)){function(m[,i])}

r