MATLAB: Plotting problem & Does the matlab can plot raster map

MATLAB

I have coordinates (X,Y) and its corresponding value (Z), How to visualize them and distinguish with different color for each point? Just like a raster file that every pixel has a value in it.

Thank you very much!

Best Answer

Let X,Y,Z be your m*3 data.

x = unique(X) ; nx = length(x) ; 
y = unique(X) ; ny = length(y) ; 
X = reshape(X,nx,ny) ;
Y = reshape(Y,nx,ny) ;
Z = reshape(Z,nx,ny) ; 
figure
pcolor(X,Y,Z)
shading interp 
figure
surf(X,Y,Z)
shading interp

Related Solutions

MATLAB: Creating a scatter plot with three variables.

This uses the value of ‘Z’ to scale the colors:

x = 1:20;
y = 1:20;
[X,Y] = ndgrid(x,y);                                        % Create Grids
Z = (X - 10).*(Y - 10);                                     % Create ‘Z’
figure
scatter3(X(:), Y(:), Z(:), [], Z(:), 'filled')              % Use ‘Z(:)’ To Scale Colors

Experiment to get the result you want with your data.

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

Related Solutions

MATLAB: Creating a scatter plot with three variables.

MATLAB: Contour plot for given x,y,z

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