With a ribbon plot, how to make the ribbons go along each matrix row instead of each column?
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Jeff Owen
el 18 de Jul. de 2024 a las 17:59
Comentada: dpb
el 20 de Jul. de 2024 a las 22:14
In the ribbon command, the ribbons run along each column of the matrix. The Y vector must be of length = to the number of rows in the matrix. How do I get the ribbons to run along each row of the matrix? I tried many combinations of flipud, fliplr, transpose, etc., and either the axis is going in the wrong direction, or the labels are wrong.
Z=[0,1,2,2; 1,2,3,3; 2,3,4,4; 3,4,5,5]
Y=[0;1;2;3]
ribbon(Y,Z,0.1);
Here the ribbons run in the y direction, but I want them to run in the x direction. Nothing else, e.g., the axis numbering, should change.
4 comentarios
dpb
el 19 de Jul. de 2024 a las 18:15
Editada: dpb
el 19 de Jul. de 2024 a las 18:16
"...With the type of figure I'm generating, I would be happy with just lines in a 3D plot"
t = 0:pi/500:pi;
X(:,1) = sin(t).*cos(10*t);
X(:,2) = sin(t).*cos(12*t);
X(:,3) = sin(t).*cos(20*t);
Y(:,1) = sin(t).*sin(10*t);
Y(:,2) = sin(t).*sin(12*t);
Y(:,3) = sin(t).*sin(20*t);
Z = cos(t);
plot3(X,Y,Z,'color','k')
Using the example of multiple lines from the doc
Respuesta aceptada
dpb
el 19 de Jul. de 2024 a las 18:24
Editada: dpb
el 19 de Jul. de 2024 a las 19:34
X=[1:4];
Y=[0:3];
Z=[0,1,2,2; 1,2,3,3; 2,3,4,4; 3,4,5,5].';
plot3(X,Y,Z,'k-')
grid on
xlabel('X'), ylabel('Y')
It would be interesting to see a real dataset...
2 comentarios
dpb
el 20 de Jul. de 2024 a las 22:14
Indeed, his is a neat trick...but for your expressed end purpose, plot3 is probably the better tool based on your sample plots above, and not the toy dataset for the Q?
Más respuestas (2)
Voss
el 18 de Jul. de 2024 a las 21:09
Editada: Voss
el 18 de Jul. de 2024 a las 21:10
If you have some leeway on the x- and y-axis tick locations, you can use ribbon with the tranpose of Z and just alter the axis labels and orientation:
Z=[0,1,2,2; 1,2,3,3; 2,3,4,4; 3,4,5,5];
Y = (0:size(Z,2)-1).';
figure
ribbon(Y,Z.',0.1);
xlabel('y')
ylabel('x')
set(gca(),'XDir','reverse')
view([52.5,30])
4 comentarios
dpb
el 19 de Jul. de 2024 a las 14:20
Agreed that it is clever with existing ribbon function -- I started down that path but beat me here (although this response wasn't yet up). The y.' is obvious; I wasn't sure @Jeff Owen would think relabeling the axes was kosher or not...
Still, it seems a weakness in the supplied function that it doesn't have the ability to specify which axes orientation against which to draw the ribbons.
Voss
el 19 de Jul. de 2024 a las 14:35
"it seems a weakness in the supplied function that it doesn't have the ability to specify which axes orientation against which to draw the ribbons"
I agree.
Voss
el 18 de Jul. de 2024 a las 19:34
Z=[0,1,2,2; 1,2,3,3; 2,3,4,4; 3,4,5,5];
[m,n] = size(Z);
Y = (0:m-1).';
X = (0:n-1).';
Original ribbon plot, for reference:
figure
ribbon(Y,Z,0.1);
xlabel('x')
ylabel('y')
Create surface objects (what ribbon creates), but with the desired properties:
figure
w = 0.1;
for ii = 1:m
surface([X+1,X+1],(ii-1)*ones(n,1)+w/2*[-1 1],Z([ii ii],:).',ii*ones(n,2));
end
view(3)
grid on
xlabel('x')
ylabel('y')
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