[R] plot each column of a matrix or dataframe versus x in a single plot

[tomaschwutz]

How do a plot several columns of a matrix at once in a single plot
versus a single x-variable?

The default plot.matrix  or plot.dataframe commands plot each column
versus each other column in several sub-plots. I want to plot each
column versus a single other vector (x) as several lines or points in
one plot.

I can do it by hand: get the range of all variables (i.e. columns of
the matrix or dataframe), initiate an empty plot command, loop through
all the columns and issue a lines or points command.
I guess there is a predefined sophisticated function for that,
however, I was not able to find it.

Does someone know where I find such a function?

Best regards
tomaschwutz