I'm running my code and I am getting an error about how the vector must be the same length. Does anyone have advice because I thought the vectors were fillled to the same length?

`ntrails = 20;N_run = zeros(ntrails,1);BC = [5,-5,-5,5];for trail = 1:1:ntrails xA = -5; xAK = xA; yA= 0; yAK = yA; xB = 5; xBK = xB; yB = 0; yBK = yB; nsteps = 1000; collision_flag = 0; k = 0; while collision_flag == 0 && k < nsteps [xAKp1, yAKP1] = RandWalk_2D(xAK,yAK,BC); [xBKp1, yBKP1] = RandWalk_2D(xBK,yBK,BC); xAK_val = [xAK-.5, xAK + .5, xAK + .5, xAK -.5]; yAK_val = [yAK-.5, yAK + .5, yAK + .5, yAK - .5]; xAKp1_val = [xAKp1-.5, xAKp1 + .5, xAKp1 + .5, xAKp1 -.5]; yAKp1_val = [yAKp1-.5, yAKp1 + .5, yAKp1 + .5, yAKp1 - .5]; xBK_val = [xBK-.5, xBK + .5, xBK + .5, xBK -.5]; yBK_val = [yBK-.5, yBK + .5, yBK + .5, yBK - .5]; xBKp1_val = [xBKp1-.5, xBKp1 + .5, xBKp1 + .5, xBKp1 -.5]; yBKp1_val = [yBKp1-.5, yBKp1 + .5, yBKp1 + .5, yBKp1 - .5]; figure(1) hold on xlim([-5.5,5.5,]) ylim([-5.5,5.5,]) fill(xAK_val,yAK_val,'r') %current step A`

fill(xAKp1_val, yAKp1_val, 'b')%next step for A

fill(xBK_val,yBK_val,'r') %current step B

fill(xBKp1_val, yBKp1_val, 'b')%next step for B

hold off xAK = xAKp1; yAK = yAKp1; xBK = xBKP1; yBK = yBKp1; k = k+1; if xAK == xBK && yAK == yBK collision_flag = 1; N_run(trail) = k; end endend medval = median(N_run) function [x,y] = RandWalk_2D(x0,y0,BC) r = rand; if r<0.2 x = x0; y = y0+1; if y >= BC(1); y = BC(1); end else if 0.2 < r && r <= 0.4; x = x0; y = y0-1; if y <= BC(2); y = BC(2); end elseif 0.4< r && r<=0.6 x = x0 - 1; y = y0; if x<= BC(3); x = BC(3) end elseif 0.6 < r && r <= 0.8; x = x0+1; y = y0; if x >= BC(4); x = BC(4); end elseif 0.8<r x = x0; y = y0; end endend

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