Contour plot for given x,y,z

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Manish Kumar
Manish Kumar 2019-3-13
编辑： KSSV 2019-3-13
Dear All,
I have x, y, and z data. I was unable to plot 2D contour. 1st column is x, 2nd column is y and 3rd column is z. Kindly help.
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Manish Kumar
Manish Kumar 2019-3-13
i have tried
contour (x,y,z)
Error is:
Error using contour (line 48)
Z must be at least a 2x2 matrix.
Error in Untitled (line 1)
contour (x,y,z)

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KSSV
KSSV 2019-3-13
编辑：KSSV 2019-3-13
[num,txt,raw] = xlsread('Book1.xlsx') ;
x = num(:,1) ;
y = num(:,2) ;
z = num(:,3) ;
figure(1)
scatter(x,y,20,z,'filled') ; colorbar
%% Method 1 / Griddata
nx = 500 ; ny = 500 ;
[X,Y] = meshgrid(linspace(min(x),max(x),nx),linspace(min(y),max(y),ny)) ;
Z =griddata(x,y,z,X,Y) ;
figure(2)
contour(X,Y,Z) ;
figure(3)
pcolor(X,Y,Z)
shading interp
%% Method 2 simple reshaping
x = unique(x) ; nx = length(x) ;
y = unique(y) ; ny = length(y) ;
Z = reshape(z,ny,nx) ;
figure(4)
contour(x,y,Z)

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