Rotate 2D function

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Alessio Pizziol
Alessio Pizziol 2020-4-4
回答： Tommy 2020-4-4
Hi everyone,
I am trying to rotate a function of a certain angle around the origin. I've found something on internet but doesn't work. I put my code so you can see what I'm going to do.
Thanks
figure(1);
Function = 45/4 - (27*x)/2; %My function
fplot(Funciton, '-'); %Plotting my function
hold on
%I've tried this but not work
h = fplot(Funciton, '-');
rotate(h,[0 0],angoli(ii-1));
hold on

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回答（1 个）

Tommy
Tommy 2020-4-4
To rotate by pi/2 radians about the z axis, you can use:
syms x
figure(1);
Function = 45/4 - (27*x)/2; %My function
fplot(x, Function, '-'); %Plotting my function
hold on
syms t
R = [cos(t) -sin(t); sin(t) cos(t)]; % rotation matrix
rotXY = subs(R*[x;Function], t, pi/2);
fplot(rotXY(1), rotXY(2));
For more info, see https://www.mathworks.com/help/symbolic/examples/rotation-matrix-and-transformation-matrix.html

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