Triangular plot, Plotting, MATLAB, Ternary plot, color plot, Contour map

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Farshad Daraei Ghadikolaei 2020-10-20

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https://ww2.mathworks.cn/matlabcentral/answers/619553-triangular-plot-plotting-matlab-ternary-plot-color-plot-contour-map

评论： Onkar Khadke 2021-8-26

IMG_20201019_235032_271.jpg

Still no one could help me with this question. I have a .csv file with 3 columns of different range of data. Each column contains 500,000 rows including some duplicate numbers. I am trying to plot a color plot like the one I attached here. A triangular color plot, like conotur map.

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Onkar Khadke 2021-8-26

Hello Farshad,

I am too looking for getting a triangular plot. Did you made any more progress on that, if so then kindly share the script for my reference. Your help is appreciated Thank you

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回答（2 个）

KSSV 2020-10-20

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https://ww2.mathworks.cn/matlabcentral/answers/619553-triangular-plot-plotting-matlab-ternary-plot-color-plot-contour-map#answer_518713

在 MATLAB Online 中打开

Let A be your m*3 column array. Try this:

x = A(:,1) ; y = A(:,2) ; z = A(:,3) ;
%%structured 
xi = unique(x) ; yi = unique(y) ;
[X,Y] = meshgrid(xi,yi) ;
Z = reshape(z,size(X)) ;
figure
surf(X,Y,Z)
%%unstructured 
dt = delaunayTriangulation(x,y) ;
tri = dt.ConnectivityList ;
figure
trisurf(tri,x,y,z)
%% USe Interpoaltion
m = 100 ; n = 100 ;
xi = linspace(min(x),max(x),m) ;
yi = linspace(min(y),max(y),n) ;
[X,Y] = meshgrid(xi,yi) ;
Z = griddata(x,y,z,X,Y) ;
pcolor(X,Y,Z)
shading interp 
colorbar

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Farshad Daraei Ghadikolaei 2020-10-20

Thank you KSS for your time. Your code gave me the attached graph (The one with colorbar). But it is not something that I am trying to have. I also attached the plot that I wish to have. Is it possible to have this type of graph based on my dada?

KSSV 2020-10-20

If you know the triangular dimension.......make the vertices....use inpolygon and pick only the points inside this triangle and plot.

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Farshad Daraei Ghadikolaei 2020-10-20

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https://ww2.mathworks.cn/matlabcentral/answers/619553-triangular-plot-plotting-matlab-ternary-plot-color-plot-contour-map#answer_518893

How about make the data normalize? Then each triangle's sides will be betwee 0 to 1. But I am not sure how to code this.

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KSSV 2020-10-20

No that will not help....do you have triangle coordinates?

Farshad Daraei Ghadikolaei 2020-10-20

What do you mean by triangle coordinates? I need to plot those 3 columns together as a colorplot, then the graph will be in triangle shape, same as attached plot.

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