From: Gabor Grothendieck > > Try this: > > > rbind(c(x)) > cbind(c(x)) > t(c(x))
The c() is not needed above. Also, this might be a better way of computing a quadratic form: > x <- 1:3 > m <- matrix(sample(1:9), 3, 3) > crossprod(crossprod(m, x), x) [,1] [1,] 202 > t(x) %*% m %*% x # Just checking... [,1] [1,] 202 In R, it usually makes little difference whether a vector is row-vector or column-vector. Andy > On 2/2/06, Michael <[EMAIL PROTECTED]> wrote: > > Hi all, > > > > I tended to use rbind, or cbind to force a vector be be > deemed as a column > > or row vector. This is very important if I want to do > things like u' * A * > > u, where u' is a row vector and u is a column vector, > regardless of what > > originall format the "u" is... I want to recast it to > column vector or row > > vector... How can I do that? > > > > ---------------------------------------------------- > > > > > > b_hat=solve(t(X) %*% X) %*% t(X) %*% Y; > > > > attr(b_hat, "dim") > > [1] 4 1 > > > > rbind(b_hat) > > [,1] > > -4.814763 > > V -5.804245 > > -5.122668 > > -4.308326 > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > R-help@stat.math.ethz.ch mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > > > > ______________________________________________ > R-help@stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > > ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html