constructing a legend for coloured circle scatter

hi, i've been having lots of fun with scatter plots and

    > coloured circles. i want to provide a legend.

    > i'm using colour to define discrete elements rather than
    > continuous values (so colorbar() isn't much help to me -- i
    > think...)

    > basically: (red) chevrolet (orange) mazda (yellow) honda ...

    > any tips?

I could guess at what you are trying to do, but it would help a lot if
you posted an example that we could run, with comments about what you
want to happen versus what is happening.

Have you seen examples/, which illustrates how to make
legends for a subset of objects in the plot?