How to rotate pcolor plot with an angle?

Hello All,

I want to rotate pcolor plot with an angle.

How can I do it?

Thanks in advance.

Answer 1

[Shashi Kiran]

Hi @Riyadh,

To rotate a "pcolor" plot by a specified angle, you can use a rotation matrix.

Assuming you want to rotate the plot by an angle "theta" in an anticlockwise direction around the origin, here is how you can achieve this using an example from https://www.mathworks.com/help/matlab/ref/pcolor.html:

% Original data
X = [1 2 3; 1 2 3; 1 2 3];
Y = X';
mymap = [1 0 0; 0 1 0; 0 0 1; 1 1 0; 0 0 0];
C = [3 4 5; 1 2 5; 5 5 5];

% Plot the original data
pcolor(X, Y, C);
colormap(mymap);

theta = 45;
theta_rad = deg2rad(theta);

% 2D rotation matrix
R = [cos(theta_rad) -sin(theta_rad); sin(theta_rad) cos(theta_rad)];

% Rotate coordinates
XY_rotated = R * [X(:)'; Y(:)'];
X_rotated = reshape(XY_rotated(1, :), size(X));
Y_rotated = reshape(XY_rotated(2, :), size(Y));

% Plot rotated data
pcolor(X_rotated, Y_rotated, C)
colormap(mymap)

Refer to the following documentations for more details:

1. pcolor: https://in.mathworks.com/help/matlab/ref/pcolor.html

Hope this helps.

[Riyadh]

Thank you!