Matrix to data.frame with factors

Hello,

Try the following.

x <- matrix(sample(0:1, 12, TRUE), ncol = 4)
y <- data.frame(apply(x, 2, factor))
str(y)

Hope this helps,
Another way, possibly more easily generalized:

x <- matrix(sample(0:1, 12, TRUE), ncol = 4)
y <- as.data.frame(x)
y[] <- lapply(y, factor, levels=0:1)
str(y)

with extensions like

is01 <- function(x) all(na.omit(x) %in% 0:1)
x <- matrix(sample(0:1, 12, TRUE), ncol = 4)
y <- as.data.frame(x)
ix <- sapply(y, is01)
y[ix] <- lapply(y[ix], factor, levels=0:1, labels=c("n","y"))
str(y)
Rui Barradas
Em 19-10-2012 12:04, brunosm escreveu:
Hi all,

I have a matrix with 100 variables: each variable as a value of 0 or 1.

What i want to do is convert this matrix to a data.frame but convert all the
variables to factors (0 and 1) also.

I know i can do this one variable a time but i have 100 variables...

Any easy way of doing this??

Thanks a lot,

Bruno

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Matrix to data.frame with factors

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