Use %in% indeed of '==' a[a[,1] %in% b,]
On 09/03/2008, Waverley <[EMAIL PROTECTED]> wrote: > Hi, > > I have a matrix > a = matrix (1:16, 4, 4) > b = c (2,3) > > I want to find out which rows of a, where a[,1] equals any values of b? > > I know that if b is only one value, e.g, b=2, then what I want is a[a[,1] == > 2,] > > But what about if it is not one value but a vector of values? > > Thanks much in advance. > > -- > Waverley @ Palo Alto > > ______________________________________________ > R-help@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. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O ______________________________________________ R-help@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.
