Uniform Rectangular Data Subscripting Function
subscript2d is for subscripting matrices and data frames.
subscript2d(x,i,j) subscript2dMatrix(x,i,j) subscript2dDataFrame(x,i,j)
x |
a matrix or data frame |
i |
first (row) subscript. |
j |
second (column) subscript. |
subscript2d(x,i,j) is like x[i,j,drop=F],
except that it allows x[,1] (for example) for atomic vectors as well,
and it always returns an object of the same class as x
(that is, it does not support a drop argument).
x <- 1:10 subscript2d(x,3,1) subscript2d(data.frame(x),3,1) subscript2d(matrix(x),3,1)
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