Random walk or stepping

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Muzaffar Habib 2018-11-25

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https://ww2.mathworks.cn/matlabcentral/answers/431867-random-walk-or-stepping

评论： Muzaffar Habib 2018-11-27

hello, i have a 5x5 matrix and i am standing at 2,2 location, now from here i have to take one step and jump to new value. i can take jump in all 4 directions i,e i-1,i+1,j-1,j+1 with equal probability of 0.25, and also i have to update my location for making a counter loop for continous movement inside matrix.how can i code it using randperm ? or any other command available ?

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Muzaffar Habib 2018-11-26

Thank You. Much appreciated help. I will try to code that up with randi()

Walter Roberson 2018-11-26

在 MATLAB Online 中打开

To "bounce back to the same location" you can use techniques such as

new_x_position = max( min(new_x_position, maximum_x_position), minimum_x_position )

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采纳的回答

Eyal Ben-Hur 2018-11-26

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在 MATLAB Online 中打开

Here is a suggestion:

A = zeros(5); % the matrix
p ={2,2}; % initial location
A(p{:}) = 1; % set initial location
N = 20; % no. of steps
for k = 1:N
    s = 1-(rand<0.5)*2; % random +/-
    vh = randi(2); % random vertical or horizontal
    p{vh} = p{vh}+s; % move
    p{vh} = abs(p{vh}-5*(p{vh}==6 || p{vh}==0)); % if outbound, return from the other side
    A = zeros(5); % remove last location
    A(p{:}) = 1; % set new location
end