This is nicer without a loop:
mean_travel1 = sum(arrival(depart_time < 100,1));
mean_travel2 = sum(arrival(100 < depart_time & depart_time < 200, 1));
... etc.
By the way, why is depart_time == 100 excluded?
If 100 etc. can be included:
G = discretize(depart_time, [-inf, 100, 200, 300, 400, 500, inf]);
S = splitapply(@sum, arrival, G);
Or with a loop:
mean_travel = zeros(1, 6); % Better than hiding an index in the name!
for i = 1:1:91
if depart_time(i) < 100
mean_travel(1) = mean_travel(1) + arrival(i,1);
elseif 100 < depart_time(i) & depart_time(i)< 200
mean_travel(2) = mean_travel(2) + arrival(i,1);
elseif 200 < depart_time(i) & depart_time(i) < 300
mean_travel(3) = mean_travel(3) + arrival(i,1);
elseif 300 < depart_time(i) & depart_time(i) < 400
mean_travel(4) = mean_travel(4) + arrival(i,1);
elseif 400 < depart_time(i) & depart_time(i) < 500
mean_travel(5) = mean_travel(5) + arrival(i,1);
else
mean_travel(6) = mean_travel(6) + arrival(i,1);
end
end
