question about matrix one column values matching a vector of values
Use %in% indeed of '==' a[a[,1] %in% b,]
On 09/03/2008, Waverley <waverley.paloalto at gmail.com> 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
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