Revise the code of randomWalkPoints to have the entity go with equal probability

Question

Revise the code of randomWalkPoints to have the entity go with equal probability in a N, S, E, or W direction. Hint: Choose the direction based on the value of a random integer, 0, 1, 2, or 3. Please note the bolded.

function [lst] = randomWalkPoints(n)
% RANDOMWALKPOINTS Function to produce a random walk, where at each time
% step the entity goes diagonally in a NE, NW, SE, or SW direction, and to
% return a list of the points in the walk
% Pre:   n is the number of steps in the walk.
% Post:   A list of the points in the walk has been returned.
x = 0;
y = 0;
lst = zeros(n + 1,2);
lst(1, :) = [0 0];
for i = 1:n
    if randi([0,1]) == 0
        x = x + 1;
    else
        x = x - 1;
    end;
    if randi([0,1]) == 0
        y = y + 1;
    else
        y = y - 1;
    end;
    lst(i + 1, :) = [x y];
end;   

itled03.m ×| stepwi se.m X| graphs 1.m ×1 monteCarloproject3.m randomwalkPoints.m X1 + function [1st] = randomwalkPoints(n) % RANDOMWALKPOINTS Function to produce a random walk, where at each time step the entity goes diagonally in a NE, NW, SE, or SW direction, and to % return a list of the points in the walk Pre: n is the number of steps in the walk. % Post: A list of the points in the walk has been returned. x=0 y=0 lst = zeros(n + 1,2); 1st(1, :) = [0 0]; for i 1:n if rand 1( [0,1]) = 0 x = x + 1; else x=x-1; end; if rand 1( [0,1]) = 0 y=y+1; else y=y-1; 1st(i + 1, :) = [x y]; end;

Explanation / Answer

Given below is the code for the question.
Please do rate the answer if it was helpful. Thank you

function [lst] = randomWalkPoints(n)
% RANDOMWALKPOINTS Function to produce a random walk, where at each time
% step the entity goes diagonally in a NE, NW, SE, or SW direction, and to
% return a list of the points in the walk
% Pre: n is the number of steps in the walk.
% Post: A list of the points in the walk has been returned.
x = 0;
y = 0;
lst = zeros(n + 1,2);
lst(1, :) = [0 0];
for i = 1:n
r = randi([0,3]); %generate a random number from 0-3
if r == 0 %north
y = y - 1;
elseif r == 1 %south
y = y + 1;
elseif r == 2 %east
x = x + 1;
else %west
x = x - 1;
end
lst(i + 1, :) = [x y];
end;

=================================
output
=================================
randomWalkPoints(10)
ans =

0 0
0 -1
0 -2
-1 -2
0 -2
0 -1
0 0
1 0
0 0
0 1
-1 1

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