[R] matrix indexing/subset error

Jeff Newmiller jdnewmil at dcn.davis.ca.us
Mon May 30 21:47:50 CEST 2016

z %% 2 == 1

has 12 logical values.  What do you expect R to do with it worth respect to 4 rows? 
Sent from my phone. Please excuse my brevity.

On May 30, 2016 11:38:46 AM PDT, Carl Sutton via R-help <r-help at r-project.org> wrote:
>Hi Guru's
>In my quest to understand R I have what I thought was a simple exercise
>that now has me baffled.  Why the error message after running this
>code?  I am totally baffled by the error message.  I was expecting rows
>1 and 3 of the x matrix to be returned, and have not a clue as to why
>this becomes a subscript difficulty.  The manual was of no help in this
>x <- c(1:3,2:4)
>x  <- matrix(x, nrow = 3)
>z <- c(1:4,1,1,0,0,1,0,1,0)
>z <- matrix(z, ncol = 3)
>x[x[,2]>= 3,]
>z %% 2 == 1
>x[z %% 2 == 1,]Error in x[z%%2 == 1, ] : (subscript) logical subscript
>too long
>Many thanks for your assistance.
>Carl Sutton CPA
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>R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>PLEASE do read the posting guide
>and provide commented, minimal, self-contained, reproducible code.

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