Lower-triangular matrix
Convert a symmetric distance matrix to a column order lower triangular matrix.
lower(m)
m |
a symmetric distance matrix. |
Converts a symmetric matrix, for example a dissimilarity matrix,
into a column order lower-triangular matrix. This may be useful
to format the input for certain clustering and ordination functions.
Note that lower() used on a 1x1 matrix will return the single
element, which may not be the correct behavior in all cases,
while full() used on a single element will return a 2x2 matrix.
column order lower triangular matrix.
Sarah Goslee
x.vec <- seq_len(6) x.vec # Make an R-style column order symmetric matrix full(x.vec) # Extract the lower triangle from a symmetric matrix # in column order lower(full(x.vec)) # Convert to or from a row order symmetric matrix fixdmat(x.vec) lower(fixdmat(x.vec)) fixdmat(c(1, 2, 4, 3, 5, 6))
Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.