display max ,min and a value of array in plot

hello everyone, Im trying to disply the values of max, min and average of the relative error in the graph

A= matrix 20x2

V_interpolation = matrix 20x1

V_exper = -A(:,2);

r_exper = A(:,1);

Absuolut_Error = -abs(V_interpolation - V_exper);

Relative_Error = -abs(Absuolut_Error/(V_exper))

Max= max(Relative_Error);

Min= min(Relative_Error);

Average = mean(Relative_Error);

Answer 1

[Image Analyst]

Use plot() if you want to indicate with a marker. Use yline() or line() if you want to draw a line from the axis. Use sprintf() and text() if you want to put text onto the graph.

[amjad almaarafawi]

thank you for your response, but how will it be done as a marker or to put text into graph. if you don't mind showing me exmple. Im very new to matlab.

thanks

[Image Analyst]

Try this:

% Create data
period = 250;
sigma = 250;
x = linspace(-500, 500, 1000);
attenuationSignal = exp(-(x - 75).^2/sigma^2);
y = sin(2 * pi * x / period) .* attenuationSignal;
% Plot data
plot(x, y, 'b-', 'LineWidth', 2);
grid on;
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0, 0.04, 1, 0.96]);

% Find the max
[yMax, indexAtMax] = max(y);
xMax = x(indexAtMax)
% Plot a red marker there
hold on;
plot(xMax, yMax, 'rv', 'LineWidth', 2, 'MarkerSize', 15);
ylim([-1, 1.2]);
% Put a horizontal line from left side to max
yl = ylim; % Get range of plot.
xl = xlim; % Get range of plot.
line([xl(1), xMax], [yMax, yMax], 'Color', 'r', 'LineWidth', 2);
% Put a vertical line from bottom side to max
line([xMax, xMax], [yl(1), yMax], 'Color', 'r', 'LineWidth', 2);
% Add axis labels.
fontSize = 20
xlabel('x', 'FontSize', fontSize);
ylabel('y', 'FontSize', fontSize);
title('Demo for Amjad by Image Analyst', 'FontSize', fontSize);

If it works and we're done, then can you "Accept this answer"? Thanks in advance.

[amjad almaarafawi]

well done thank you so much I reall appreicated your hlep

[salah chouchane]

Thank you my friend.