On Oct 19, 2012, at 16:07 , Rui Barradas wrote:
> 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
>>
>>
>>
>> --
>> View this message in context:
http://r.789695.n4.nabble.com/Matrix-to-data-frame-with-factors-tp4646730.html
>> Sent from the R help mailing list archive at Nabble.com.
>>
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>
> ______________________________________________
> R-help at r-project.org mailing list
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