Rotation of a contour plot

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Mahi Nazir
Mahi Nazir on 9 Jul 2014
Commented: Mattalabba on 15 Nov 2018
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

Accepted Answer

Grzegorz Knor
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
Mahi Nazir
Mahi Nazir on 9 Jul 2014
This is super! That's what I exactly wanted. Thank you so much :) Cheers
Mattalabba
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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