Hi Christopher,
Try this ->
% I have assumed the names of arrays as below
speed_time = duration(15, 15, 24:45);
speed_values = [3, 4, 5, 3, 4, 5, 3, 4, 5, 3, 3, 4, 5, 6, 7, 5, 3, 4, 3, 3, 2, 2]; % I extended the array from the image to show the result
hr_time = duration(15, 15, [24, 30, 39]);
hr_values = [143, 145, 134];
performance = [];
for i = 1:length(hr_time)-1
indices = find(speed_time >= hr_time(i) & speed_time < hr_time(i+1));
mean_speed = mean(speed_values(indices));
performance = [performance, mean_speed / hr_values(i)];
end
% Handling the last heart rate measurement
indices = find(speed_time >= hr_time(end));
mean_speed = mean(speed_values(indices));
performance = [performance, mean_speed / hr_values(end)];
disp(performance);
