2D color or surface plot based on 3 vectors of data

26 次查看（过去 30 天）
Jordi Riba
Jordi Riba 2018-4-11
评论： Jordi Riba 2018-4-12
I want to do a 2D plot based on 3 vectors of data (X,Y and Z) coming from rig results, in order to have some color surfaces between the points that shows the trend to where the values are increasing or decreasing. Ideally should contain also some iso-lines appart from the Colors. Not sure how to achieve it but I have seen it published.
The closest I could get to what I want was to use a simple scatter (X,Y Z) plot. But when I tried to generate surfaces between them by using the ‘peaks’ function then I had the problem that my X and Y plots are not strictly increasing or decreasing, and that there were some repeated values, so I could not use the function ‘contourf’.
Any help is more than welcome!

请先登录，再回答此问题。

采纳的回答

Pawel Jastrzebski
Pawel Jastrzebski 2018-4-11
编辑：Pawel Jastrzebski 2018-4-11
How about this:
% interpolation data
% as in:
% https://uk.mathworks.com/help/matlab/ref/scatteredinterpolant.html?searchHighlight=scatteredInterpolant&s_tid=doc_srchtitle#responsive_offcanvas
F = scatteredInterpolant(datarig.X,datarig.Y,datarig.Z);
[xq,yq] = meshgrid(40:115,25:65);
F.Method = 'natural';
zq = F(xq,yq);
%colorbar data
limLow = min(datarig.Z);
limHi = max(datarig.Z);
c = linspace(limLow,limHi,length(datarig.Z));
figure;
scatter3(datarig.X,datarig.Y,datarig.Z,[],c);
caxis([limLow, limHi])
colorbar('Limits',[limLow, limHi]);
hold on;
contourf(xq,yq,zq)
%surface(xq,yq,zq)
%view(90,90)
Output:
  4 个评论
显示 2更早的评论
Pawel Jastrzebski
Pawel Jastrzebski 2018-4-12
Plot only the:
figure;
contourf(xq,yq,zq)
And nothing else. I added the other plots to see how the interpolation really worked.
Jordi Riba
Jordi Riba 2018-4-12
Thanks Pawel!!! it works really well !!! Cheers! Jordi

请先登录，再进行评论。

更多回答（1 个）

Pawel Jastrzebski
Pawel Jastrzebski 2018-4-11
In order to be able to use contour plot, your Z data need to be of X*Y size. What you can do is the following:
% C is a matrix of colours assigned to your data
% Color will get assigned based on the user specified condition
% Simple example with 3 colors RGB
% Red = [1 0 0]
% Green = [0 1 0]
% Blue = [0 0 1]
c = zeros(size(datarig,1),3);
cond1 = datarig.Z<=1.0e+09 *1;
c(cond1,1) = 1;
cond2 = (datarig.Z>1.0e+09 *1) & (datarig.Z<=1.0e+09 *1.15);
c(cond2,2) = 1;
cond3 = ~(cond1+cond2);
c(cond3,3) = 1;
% point size
s = 25;
figure
scatter3(datarig.X,datarig.Y,datarig.Z,s,c)
view(90,90)
To obtain something like:
  1 个评论
Jordi Riba
Jordi Riba 2018-4-11
Thanks Pawel, but this is not what I wanted. To get something similar I could just simple use a scatter, and I get what is shown on the attachment. I want to create extrapolated surfaces with iso-lines.

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Discrete Data Plots 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by