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ggplot2 version of matplot()?

Submitted by naught101 on August 20, 2012

matplot() makes it easy to plot a matrix/two dimensional array by columns (also works on data frames):

a <- matrix (rnorm(100), c(10,10))
matplot(a, type='l')

Is there something similar using ggplot2, or does ggplot2 require data to be melted into a dataframe first?

Also, is there a way to arbitrarily color/style subsets of the matrix columns using a separate vector (of length=ncol(a))?