[R] count number of TRUEs in each row

[Tóth Dénes]

Hi Wendy,

try this:
Z <- matrix(runif(1000)>0.5,10,100)
rowSums(Z)

HTH,
  Denes


> Hi all,
>
> I have a huge matrix of TRUE/FALSE table like following, and I want to
> count
> the number of TRUEs in each row. Instead of looping through each row and
> do
> length(Z[Z==TRUE]), I am wondering if there is an easier way of doing
> this.
>
>        [,1]   [,2]    [,3]
> [1,]TRUE FALSE FALSE
> [2,]FALSE TRUE TRUE
>
> Thank you in advance.
> Wendy
>
> --
> View this message in context:
> http://r.789695.n4.nabble.com/count-number-of-TRUEs-in-each-row-tp3440486p3440486.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>