Rotation of a contour plot
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I have a contour plot (Image1). I need to rotate it through a certain angle. If I save it as an image and then rotate it using transformation(or rotation) matrix, the whole plot including the axes are rotated(Image2). If I use imrotate for the matrix I have of the contour, the resultant contour doesn't actually rotate by the same angle which I specify (37 deg in the example, Image3) and more over sometimes the width of the plot decreases.
Can someone please help me overcome the problem. I want rotation of the contour plot without reducing the width and rotating exactly by the specified angle. Is it the aliasing effect?
Any help will be much appreciated. Many Thanks
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Accepted Answer
Grzegorz Knor
on 9 Jul 2014
Look at this example:
a = 37;
[x,y] = meshgrid(linspace(-4,4,30));
z = exp(-x.^2/15-y.^2);
contour(x,y,z)
xlim([-5 5])
ylim([-5 5])
x = x*cosd(a) - y*sind(a);
y = y*cosd(a) + x*sind(a);
figure
contour(x,y,z)
xlim([-5 5])
ylim([-5 5])
Is that what you want?
5 Comments
Mattalabba
on 15 Nov 2018
Is it correct that this method does not work anymore in MATLAB 2015 and newer?
I recieve the error 'Index exceeds matrix dimensions. Error in rotate (line 31): ax = ancestor(h(1),'axes');'
When I change
rotate(get(h,'children'),[0 0 1],a)
to
rotate(h,[0 0 1],a)
I get no error, but also nothing changes on the contourplot.
Or am I misunderstanding something?
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