I'm slowly moving my statistical analysis from Matlab to R, and find myself
missing two features:

a) How do I mimic Matlab's 'hold on'? (I want to show several plots
together, when I type two plots one after the other the second overwrites
the first)
b) How do I mimic Matlab's 'axis'? (after drawing my plots I want to zoom on
specific parts- for example, x=0:5, y=0:20).

Thanks for any assistance.

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