Mathematica: How to obtain data points plotted by plot command?

Question

When plotting a function using Plot, I would like to obtain the set of data points plotted by the Plot command.

For instance, how can I obtain the list of points {t,f} P

Answer 1

In addition to the methods mentioned in Leonid's answer and my follow-up comment, to track plotting progress of slow functions in real time to see what's happening you could do the following (using the example of this recent question):

(* CPU intensive function *)
LogNormalStableCDF[{alpha_, beta_, gamma_, sigma_, delta_}, x_] :=
 Block[{u},
  NExpectation[
   CDF[StableDistribution[alpha, beta, gamma, sigma], (x - delta)/u], 
   u \[Distributed] LogNormalDistribution[Log[gamma], sigma]]]

(* real time tracking of plot process *)
res = {};
ListLinePlot[res // Sort, Mesh -> All] // Dynamic

Plot[(AppendTo[res, {x, #}]; #) &@
  LogNormalStableCDF[{1.5, 1, 1, 0.5, 1}, x], {x, -4, 6}, 
 PlotRange -> All, PlotPoints -> 10, MaxRecursion -> 4]

etc.