The following gotcha caught me off-guard just now. I have two matrices, a and b:
a <- matrix(1,3,3) b <- matrix(1,1,1) (note that both "a" and "b" are matrices). I want them in a list: > B <- NULL > B[[1]] <- a > B[[2]] <- b > B [[1]] [,1] [,2] [,3] [1,] 1 1 1 [2,] 1 1 1 [3,] 1 1 1 [[2]] [,1] [1,] 1 > This is fine. But swapping "a" and "b" over does not behave as desired: > B <- NULL > B[[1]] <- b > B[[2]] <- a Error in B[[2]] <- a : more elements supplied than there are to replace > The error is given because after B[[1]] <- a, the variable B is just a scalar and not a matrix (why is this?) What's the bulletproof method for assigning matrices to a list (whose length is not known at runtime)? -- Robin Hankin Uncertainty Analyst National Oceanography Centre, Southampton European Way, Southampton SO14 3ZH, UK tel 023-8059-7743 ______________________________________________ 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 and provide commented, minimal, self-contained, reproducible code.