Random 2D Particle Walk

Consider a particle that starts at the origin (0,0) and randomly walks through the x-y plane for 1000 steps. At each step, the particle moves in any ONE of 4 possible directions (+x,-x,+y,-y) at different probabilities (the probabilities of moving in any of the 4 directions must add to one). I need each particle to take 1,000 steps and for this to happen for 10,000 particles. I just need to plot the final location of each particle.

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer