Consider the (possibly asymmetric) simple random walk in 2D (i.e., id length 1 steps of right, left, up, or down) starting at the origin. Write a matlab function that returns the first n steps of an observation from the random walk. You should give the function a 4-vector containing the probabilities of up, down, left, right, and you should give it the number of steps (n). It should output a 2x (n + 1) matrix S
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