Graph lines not showing

Hi all,

I am working on a MATLAB script where I need to add horizontal lines representing the maximum and average values of my data in two subplots. However, despite my attempts, the lines are not appearing throughout the entire graph horizontally.

Here's a simplified version of the script I'm currently using:

% Create a new figure
figure;

% Plot out2.Q_i_ref (Reference Ship Ice Torque) on the upper subplot
subplot(2,1,1);
plot(out2.Q_i_ref, 'r'); % Plot the reference ship ice torque in red
hold on; % Hold the current plot

% Add a legend and lines showing maximum and average values
legend('Reference ship A ice torque');
max_value_refA = max(out2.Q_i_ref);
avg_value_refA = mean(out2.Q_i_ref);
line([1, length(out2.Q_i_ref)], [max_value_refA, max_value_refA], 'Color', 'k', 'LineStyle', '--', 'DisplayName', ['Max Value: ', num2str(max_value_refA, '%.4g')]);
line([1, length(out2.Q_i_ref)], [avg_value_refA, avg_value_refA], 'Color', 'b', 'LineStyle', '--', 'DisplayName', ['Avg Value: ', num2str(avg_value_refA, '%.4g')]);

xlabel('Time [s]');
ylabel('Ice torque [Nm]');
title('Reference ship A ice torque');
grid on;
legend show;

% Plot out.Q_i_nd (New Design Ice Torque) on the lower subplot
subplot(2,1,2);
plot(out.Q_i_nd, 'b'); % Plot the new design ice torque in blue
hold on; % Hold the current plot

% Add a legend and lines showing maximum and average values
legend('New design A ice torque');
max_value_ndA = max(out.Q_i_nd);
avg_value_ndA = mean(out.Q_i_nd);
line([1, length(out.Q_i_nd)], [max_value_ndA, max_value_ndA], 'Color', 'k', 'LineStyle', '--', 'DisplayName', ['Max Value: ', num2str(max_value_ndA, '%.4g')]);
line([1, length(out.Q_i_nd)], [avg_value_ndA, avg_value_ndA], 'Color', 'r', 'LineStyle', '--', 'DisplayName', ['Avg Value: ', num2str(avg_value_ndA, '%.4g')]);

xlabel('Time [s]');
ylabel('Ice torque [Nm]');
title('New design A ice torque');
grid on;
legend show;

Could you please suggest how I can modify the script to ensure that the horizontal lines representing the maximum and average values are visible throughout the entire graph horizontally in both subplots?

Thank you for your assistance!

[Rena Berman]

(Answers Dev) Restored edit

Answer 1

[Star Strider]

See if the yline function will do what you want.

Answer 2

[Adam Danz]

max_value_refA = max(out2.Q_i_ref);
avg_value_refA = mean(out2.Q_i_ref);
yline(max_value_refA, '--k')
yline(avg_value_refAm '--b')

max_value_ndA = max(out.Q_i_nd);
avg_value_ndA = mean(out.Q_i_nd);
yline(max_value_refA, '--k')
yline(avg_value_refAm '--r')

You could also label the lines

yline(max_value_refA, '--k', 'max')

or use the legend

yline(max_value_refA, '--k', 'DisplayName', 'max')