Do simple matrix plots, providing an easy interface to
matplot by using a default x variable.
Usage
mpl(mat, ...)
p.m(mat, ...)
Arguments
mat
numeric matrix.
...
further arguments passed to matplot,
e.g., type, xlab, etc.
Details
p.m(m) use the first column of m as $x$ variable,
whereas mpl(m) uses the integers 1, 2, ..., nrow(m)
as coordinates and rownames(m) as axis labels if possible.