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

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.

[Onkar Khadke]

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

Answer 1

[KSSV]

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

[Farshad Daraei Ghadikolaei]

Thanks KSSV for your answer. I ran your code and got this following erroe and run stoped at this stage:

Error using meshgrid (line 59)

Subscripting into a table using one subscript (as in t(i)) or three or more subscripts (as in t(i,j,k)) is not supported. Always

specify a row subscript and a variable subscript, as in t(rows,vars).

[KSSV]

It is a mistake with class of variables. Attach your data here. You should read the data into matrix. I think you are reading it as a table.

[Farshad Daraei Ghadikolaei]

Please see attach my data.

[KSSV]

You read the data like below:

A = xlsread("4b2_Combine.csv") ; 
% remove outliers 
x(x>100) = [] ; 
y(y>100) = [] ;
z(z>100) = []; 
% USe griddata
m = 1000 ; n = 1000 ;
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

[Farshad Daraei Ghadikolaei]

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]

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

Answer 2

[Farshad Daraei Ghadikolaei]

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.

[KSSV]

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

[Farshad Daraei Ghadikolaei]

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.