how to separate two graphe in one figure

how to separate two graphe in one figure like this picture in matlab

Answer 1

[Subhajyoti]

Hi @Belaid Boutqlmount,

It is my understanding that you want to draw multiple plots on the same axes. You can use 'hold on' to retains the plots in the current axes so that new plots added to the axes do not delete existing plots.

Here, in the following implementation, I have added a surface plot and a 3D line plot on the same same using the same.

% Define the grid
[x, y] = meshgrid(linspace(-1, 1, 100), linspace(-1, 1, 100));

% Define the surface function
z1 = sin(pi*x).*cos(pi*y);

% Define the second graph (e.g., a circle with noise)
theta = linspace(0, 2*pi, 100);
r = 0.5 + 0.1*rand(1, 100); % Add some noise
x2 = r .* cos(theta);
y2 = r .* sin(theta);
z2 = -2 * ones(size(x2)); % Place it below the surface

% Create the figure
figure;

% Plot the surface
surf(x, y, z1, 'EdgeColor', 'none');
hold on;

% Plot the second graph
plot3(x2, y2, z2, 'b-', 'LineWidth', 2);
plot3(x2, y2, z2, 'r.', 'MarkerSize', 10);

% Customize the view
colormap('jet');
colorbar;
xlabel('x');
ylabel('y');
zlabel('z');
grid on;

hold off;

Refer to the following MathWorks Documentation to know more about 'hold' and '3D Plots' in MATLAB Graphics:

• https://www.mathworks.com/help/matlab/ref/hold.html
• https://www.mathworks.com/help/matlab/ref/plot3.html
• https://www.mathworks.com/help/matlab/ref/scatter3.html
• https://www.mathworks.com/help/matlab/ref/meshgrid.html

[Belaid]

thnx ,is work

[Belaid]

how can plot the curve gare with equation 1+(1/10)*tanh(10*sin(25t)) in the boundary and analytical function u(x,y)=exp(2.*x+y)+sin(pi.*x).*cosh(y); to find the graphe like picture

% Define the grid

[x, y] = meshgrid(linspace(0, 2*pi, 1000), linspace(0, 2*pi, 1000));

%r=cos(2.*x).^2.*exp(cos(x)) + sin(2.*y).^2.*exp(sin(y));

% r=sqrt(cos(2.*x)+sqrt(1.1-sin(2.*x).^2));

r=1+1/10*tanh(10*sin(25*x));

r1=1+1/10*tanh(10*sin(25*y));

x1 = r .* cos(x);

y1 = r .* sin(y);

% Define the surface function

z1=exp(2.*x1+y1)+sin(pi.*x1).*cosh(y1);

% Define the second graph (e.g., a circle with noise)

theta = linspace(0, 2*pi, 100);

%r = 0.5 + 0.1*rand(1, 100);

% r=sqrt(cos(2.*theta)+sqrt(1.1-sin(2.*theta).^2));

%r=cos(2.*theta).^2.*exp(cos(theta)) + sin(2.*theta).^2.*exp(sin(theta));

r=1+1/10*tanh(10*sin(25*theta));

% Add some noise

x2 = r .* cos(theta);

y2 = r .* sin(theta);

z2 = -2 * ones(size(x2)); % Place it below the surface

% Create the figure

figure;

% Plot the surface

surf(x1, y1, z1, 'EdgeColor', 'none');

hold on;

% Plot the second graph

plot3(x2, y2, z2, 'b-', 'LineWidth', 2);

% plot3(x2, y2, z2, 'r.', 'MarkerSize', 10);

% Customize the view

colormap('jet');

colorbar;

xlabel('x');

ylabel('y');

zlabel('z');

grid on;

hold off;

Answer 2

[Image Analyst]

If you want one plot or surface to be "lifted" above the other, you can add an offset to the one you want shifted. Be aware that the axes units will not align with the original units, but with the shifted units.

[Belaid]

give me a example please

[Image Analyst]

x = linspace(0, 5*pi, 100);
y1 = cos(x);
y2 = sin(x);
y2Lifted = y2 + 3; % Raise it up by 3 units.
plot(x, y1, 'b-', 'LineWidth', 3);
hold on;
plot(x, y2, 'r-', 'LineWidth', 3);
plot(x, y2Lifted, 'm-', 'LineWidth', 3);
legend('y1', 'y2', 'y2Lifted', 'Location', 'west');
grid on;

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[Belaid]

How can plot the curve gare with equation 1+(1/10)*tanh(10*sin(25t)) in the boundary and analytical function u(x,y)=exp(2.*x+y)+sin(pi.*x).*cosh(y); to find the graph like picture?

% Define the grid
[x, y] = meshgrid(linspace(0, 2*pi, 1000), linspace(0, 2*pi, 1000));
  %r=cos(2.*x).^2.*exp(cos(x)) + sin(2.*y).^2.*exp(sin(y)); 
%   r=sqrt(cos(2.*x)+sqrt(1.1-sin(2.*x).^2)); 
r=1+1/10*tanh(10*sin(25*x));
r1=1+1/10*tanh(10*sin(25*y));

x1 = r .* cos(x);
y1 = r .* sin(y);
% Define the surface function
z1=exp(2.*x1+y1)+sin(pi.*x1).*cosh(y1);

% Define the second graph (e.g., a circle with noise)
theta = linspace(0, 2*pi, 100);
%r = 0.5 + 0.1*rand(1, 100);
% r=sqrt(cos(2.*theta)+sqrt(1.1-sin(2.*theta).^2)); 

  %r=cos(2.*theta).^2.*exp(cos(theta)) + sin(2.*theta).^2.*exp(sin(theta)); 
  r=1+1/10*tanh(10*sin(25*theta));
% Add some noise
x2 = r .* cos(theta);
y2 = r .* sin(theta);
z2 = -2 * ones(size(x2)); % Place it below the surface
% Create the figure
figure;

% Plot the surface
surf(x1, y1, z1, 'EdgeColor', 'none');
hold on;

% Plot the second graph
plot3(x2, y2, z2, 'b-', 'LineWidth', 2);
% plot3(x2, y2, z2, 'r.', 'MarkerSize', 10);

% Customize the view
colormap('jet');
colorbar;
xlabel('x');
ylabel('y');
zlabel('z');
grid on;

hold off;

[Image Analyst]

I don't understand the question. What is t? Is it x or y? And if it's one of those, what value would the other x or y have? Maybe you should start your own question rather than continue here in @Belaid Boutqlmount's question (for which he'll get emails about).