[R] Tick marks for abline

[Erin Hodgess]

Dear R People:


I am drawing graphs for a College Algebra class. I would like to have
the x and y axes, along with the lines that I am plotting.  So I leave
off the axes, and use xlim and ylim.  Then I add my abline(v=0).

However, I would like to have tick marks on the abline.  How would I do
that, please?

Thanks in advance!

Sincerely,
Erin M. Hodgess, Ph.D.
Associate Professor
Department of Computer and Mathematical Sciences
University of Houston - Downtown
One Main Street 
Houston, TX 77002
e-mail: hodgess at uhddx01.dt.uh.edu



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