How do I rotate contour plot?

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Ernest Adisi 2018-8-17

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https://ww2.mathworks.cn/matlabcentral/answers/415303-how-do-i-rotate-contour-plot

评论： Star Strider 2018-8-21

Screen Shot 2018-08-17 at 17.35.43.png

I want this contour image to have the wake moving from left to right with y, along the x axis, and conversely x along y. I've managed to change the axis but can't get the image to rotate appropriately any ideas?

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Image Analyst 2018-8-17

imrotate()?

Star Strider 2018-8-21

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Answer 1

Star Strider 2018-8-17

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It would help to know how you calculated your data, and what you’re plotting. Rotating the plot might be as simple as reversing the order of your independent variable matrices, and either transposing ‘Z’ or letting contourf default to the correct orientation.

Example —

x = linspace(0, 0.35, 75);                          % Create Data
y = linspace(0, 0.2, 50);                           % Create Data
[X,Y] = meshgrid(x,y);                              % Create Data
Z = sin(X*3*pi) .* exp(-0.5*Y);                     % Create Data
figure(1)
contourf(x, y, Z)                                   % ‘Normal’ Orientation (Vectors)
colorbar
figure(2)
contourf(X, Y, Z)                                   % ‘Normal’ Orientation (Matrices)
colorbar
figure(3)
contourf(y, x, Z')                                  % ‘Rotated’ Orientation (Vectors)
colorbar
figure(4)
contourf(Y, X, Z)                                   % ‘Rotated’ Orientation (Matrices)
colorbar

I use meshgrid here. It produces different output matrices from those ndgrid would produce, so you may need to experiment with this if you used other functions.