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# outer - the concatenation of the dimensions of X and Y(or...

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outer {base} R Documentation Outer Product of Arrays Description The outer product of the arrays X and Y is the array A with dimension c(dim(X), dim(Y)) where element A[c(arrayindex.x, arrayindex.y)] = FUN(X[arrayindex.x], Y[arrayindex.y], . ..) . Usage outer(X, Y, FUN="*", . ..) X %o% Y Arguments X, Y First and second arguments for function FUN . Typically a vector or array. FUN a function to use on the outer products, found via match.fun (except for the special case "*" ). ... optional arguments to be passed to FUN . Details X and Y must be suitable arguments for FUN . Each will be extended by rep to length the products of the lengths of X and Y before FUN is called. FUN is called with these two extended vectors as arguments. Therefore, it must be a vectorized function (or the name of one), expecting at least two arguments. Where they exist, the [dim]names of X and Y will be copied to the answer, and a dimension assigned which is

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Unformatted text preview: the concatenation of the dimensions of X and Y (or lengths if dimensions do not exist). FUN = "*" is handled internally as a special case, via as.vector(X) %*% t(as.vector(Y)) , and is intended only for numeric vectors and arrays. %o% is binary operator providing a wrapper for outer(x, y, "*") . Author(s) Jonathan Rougier References Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language . Wadsworth & Brooks/Cole. See Also %*% for usual ( inner ) matrix vector multiplication; kronecker which is based on outer ; Vectorize for vectorizing a non-vectorized function. Examples x <- 1:9; names(x) <- x # Multiplication & Power Tables x %o% x y <- 2:8; names(y) <- paste(y,":",sep="") outer(y, x, "^") outer(month.abb, 1999:2003, FUN = "paste") ## three way multiplication table: x %o% x %o% y[1:3] [Package base version 2.11.1 Index ]...
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outer - the concatenation of the dimensions of X and Y(or...

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