[Rd] dmvnorm() bug in e1071 (PR#503)

[warnes@biostat.washington.edu]

When dmvnorm is applied to matrices it fails.  The offending lines are

  if (length(x) != ncol(sigma)) {
    stop("x and sigma have non-conforming size")
  }

which works fine if x is a dataframe, but not if x is a matrix.

Replacing this test with

  if (ncol(x) != ncol(sigma)) {
    stop("x and sigma have non-conforming size")
  }

Corrects the problem, and still works for data frames and
vectors.  (Vectors have already been converted to matrices).

-Gregory


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