MATLAB: Plot a 3D matrix (1 dependent & 2 independent variables)

3d plotcontour plotMATLABplot matrix

I have a matrix with 2 independent variables (X and y) which have given data. I want to plot this data with X and Y (in the X and Y dimensions) and the corresponding data point in the Z direction so that it appears like a contour map with the independent variables giving the location and the dependent giving the magnitude. Does anyone have an idea how I could do this? Cheers

Best Answer

You could use mesh or surf. As an example, consider X and Y verctors, with Z defined as sin(X) + cos(Y).

X = linspace(0,2*pi,20);
Y = linspace(0,pi,10);
[X,Y] = meshgrid(X,Y);
Z = sin(X) + cos(Y);
surf(X,Y,Z)

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MATLAB: 4d smooth plot with slices

Solved it using the answer from:

https://www.mathworks.com/matlabcentral/answers/500825-how-to-obtain-volume-data-from-x-y-z-c-data-to-use-slice-function?s_tid=answers_rc1-1_p1_MLT

MATLAB: Contour plot for given x,y,z


[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)

Best Answer

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MATLAB: Contour plot for given x,y,z

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