MATLAB: How to plot contour when the function has no relation with the coordinates.

contourtrisurf

I have 3 matrices. x(n,1), y(n,1) and z(n,1). I want to plot the contour of 'z' in the 'x-y' coordinate. Can anyone help? I can plot it in Origin easily but I need to plot in Matlab.

Best Answer

N = 50 ;
x = rand(N,1) ;
y = rand(N,1) ;
z = rand(N,1) ;
dt = delaunayTriangulation(x,y) ;
tri = dt.ConnectivityList ;
coor = dt.Points ;
trisurf(tri,x,y,z,'EdgeColor','none');
view(2)

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MATLAB: How to write the values of a colourmap on each object

N = 10 ;
x = rand(N,1) ;
y = rand(N,1) ;
z = rand(N,1) ;
dt = delaunayTriangulation(x,y) ;
tri = dt.ConnectivityList ;
mx = mean(x(tri),2) ;
my = mean(y(tri),2) ;
mz = mean(z(tri),2) ;
trisurf(tri,x,y,z) ;
colorbar
view(2)
hold on
text(mx,my,mz,num2str(mz))

MATLAB: Plotting independent Z values at varying locations using contour

Let (x,y,z) be your values at one time step.

x = rand(10,1) ; % a randoms data 
y = rand(10,1) ;
z = rand(10,1) ;
dt = delaunayTriangulation(x,y) ;   % delaunay triangulation 
points = dt.Points ;    % points 
tri = dt.ConnectivityList ;    % nodal connectivity 
xx = points(:,1) ;  
yy = points(:,2) ;  
%
F = scatteredInterpolant([x y],z);
zz = F(xx,yy) ;
trisurf(tri,xx,yy,zz) ; view(2) ; shading interp

Best Answer

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MATLAB: How to write the values of a colourmap on each object

MATLAB: Plotting independent Z values at varying locations using contour

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