MATLAB: 3D plot of data

3d plotsMATLAB

Hello.
I have a data set consisting of stresses accociated with a coordinate point (x,z). The data is attached, note that all the y coordiantes are the same, ie the stresses are on a flat surface consisting of x and z. The data for the stresses are in colum B.
I would like to create a 3D plot or surface of my stresses, but I am unsure how to associate my stresses with a specific point, so that I can plot them. I have tried using meshgrid and surf, but not with any kind of sucess worth attaching.

Best Answer

Option 1: USe scatter:
[num,txt,raw] = xlsread('Data_3Dplot.xlsx') ;
num = num(9:end,:) ; 
nodes = num(:,1) ; 
value = num(:,2) ; 
x = num(:,3) ; 
y = num(:,4) ; 
z = num(:,5) ; 
scatter3(x,y,z,10,value,'filled')
Option 2: Make unstructured grid 
[num,txt,raw] = xlsread('Data_3Dplot.xlsx') ;
num = num(10:end,:) ; 
nodes = num(:,1) ; 
value = num(:,2) ; 
x = num(:,3) ; 
y = num(:,4) ; 
z = num(:,5) ; 
dt = delaunayTriangulation(x,z) ;
t = dt.ConnectivityList ; 
p = dt.Points ; 
p(:,3) = value ; 
trisurf(t,p(:,1),p(:,2),p(:,3));
view(2)
shading interp ; colorbar
Option 3: Make a structured grid 
[num,txt,raw] = xlsread('Data_3Dplot.xlsx') ;
num = num(10:end,:) ; 
nodes = num(:,1) ; 
value = num(:,2) ; 
x = num(:,3) ; 
y = num(:,4) ; 
z = num(:,5) ; 
N = 500 ; 
xi = linspace(min(x),max(x),N) ; 
zi = linspace(min(z),max(z),N) ; 
[X,Z] = meshgrid(xi,zi) ; 
C = griddata(x,z,value,X,Z) ; 
surf(X,Z,C) 
shading interp ; colorbar 
view(2)
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