[R] count number of TRUEs in each row

[Wendy]

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

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