using colormap in plot3d
显示 更早的评论
Hello everyone,
I have a matrix of 500x3 in which columns are x,y,z values of a single point respectively. I am plotting this with scatter3 function and use the Z values as the colormap. But now, I want the every Z value increase in some interval(for ex. from 5 to 6) but X and Y are constant for every point. So I used to have 500 points in the plot but now I want to have 500 lines instead of points(with constant x,y and changing z means line to me). I realized I can do that with plot3d but I cant use the Z values as colormap in that.
Is there any other way to do this?
Thank for you answers
采纳的回答
plot3(x,y,z) will produce 1 line object for each column of the inputs. Each line object can have its own color. So, all you have to do is arrange the data properly.
h = plot3([x(:).'.*[1;1]], [y(:).'.*[1;1]]), [z1(:).', z2(:).'], '-');
set(h, {'Color'}, mat2cell(jet(numel(x)),ones(numel(x),1),3));
The syntax [x(:).'.*[1;1]] produces two rows of identical x values.
The mat2cell() syntax converts your color matrix to cell array of 1x3 values.
4 个评论
Umut Ege Ulucay
2020-4-21
"I have read from somewhere that, it is not possible to assign colors in plot3d."
My answer does exactly that. But the colors are assigned to line objects after they are plotted.
"I understood the plotting part but the coloring part does not work for me."
The 2 lines in my answer are a basic overview. They do not assign a color based on the z-value. Here's how to take that step.
1) Produce a colormap (there are lots of options, see documentation). I chose jet and I chose 100 values. You can choose any map and any number of values. It does not have to match the number of data points or lines.
cmap = jet(100);
2) normalize the z values to match each z value with a row of the color matrix.
zNorm = round((z - min(z(:)))/range(z(:)) * (size(cmap,1)-1)) + 1;
zNorm should span from 1 to 100 or however long your colormap is.
3) Assign the appropriate color value. Note that zNorm must have the same number of elements as the number of handles (h). isequal(size(h(:), zNorm(:))
% Convert color matrix to cell array of 1x3 vectors
cmapCell = mat2cell(cmap,ones(size(cmap,1),1),3);
set(h(:), {'Color'}, cmapCell(zNorm(:)))
Umut Ege Ulucay
2020-4-25
Adam Danz
2020-4-26
Glad I could help!
更多回答（0 个）
类别
在 帮助中心 和 File Exchange 中查找有关 Color and Styling 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
