Rotate the plot at 45 degree

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Sharah
Sharah el 29 de Sept. de 2016
Comentada: Raj el 11 de Ag. de 2023
Can anyone tell me how to rotate the plot from the following image so that the now the linear reference line will be a straight vertical line, and the red and green line will fall on the left side of the plot?
for a reference the red and green line is just a data that I plot with different slope.
  1 comentario
Raj
Raj el 11 de Ag. de 2023
creat a vector nameed v2 containing the last coloum of data

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Respuestas (2)

Jakub Rysanek
Jakub Rysanek el 4 de Oct. de 2016
I would simply rotate all data using the planar (2D) transform with respect to the origin:
angle = pi/4;
reference_line = [0 1 2 3 4 5 6];
data_x = [0 1 2 3 4 5 6];
data_y = [0 1.1 2.2 3.3 4.4 5.5 6.6];
% 2D rotation
x2 = data_x*cos(angle)-data_y*sin(angle);
y2 = data_y*cos(angle)+data_x*sin(angle);
figure;
hold on;
p1=plot(reference_line,reference_line,'marker','none','linestyle','--');
p2=plot(data_x,data_y,'-r');
p3=plot(x2,y2,'-b');
p4=plot(zeros(1,7),reference_line,'-k');
set(gca,'ylim',[0 6],'xlim',[-6 6]);
axis square;
legend([p1,p2,p3,p4],{'Reference line','Original data','Rotated data','Vertical line'},'Location','southwest');

Walter Roberson
Walter Roberson el 29 de Sept. de 2016
Create an hgtransform, set the axes parent to be the transform, set the rotation matrix for the transform to have the appropriate rotation.
Note: this will transform the axes too, rotating the entire plot.
If you want just the data to be rotated then the easiest single way would probably:
[th, r] = cart2pol(x, y);
[nx, ny] = pol2cart(th+pi/4, r);
Your x and y arrays will need to be the same size for this to work, so if you have multiple columns in your y array (one column per line) and a vector x, then use repmat(x(:), 1, size(y,2)) as the x for the rotation.
  1 comentario
Ryan Webb
Ryan Webb el 1 de Sept. de 2022
Can you clarify on "set the axes parent to be the transform"
set(ax,'Parent',t)
gives the error:
Error using matlab.graphics.axis.Axes/set
Axes cannot be a child of Transform.

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