MATLAB: How to create a contour map with the data coordinat and data elevation

how to make contur map

          if true
            % code
          end

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data = importdata('pengolahan.txt') ;
n = data(:,1) ;  % serial no. 
x = data(:,2) ; 
y = data(:,3) ; 
z = data(:,4) ; 
tri = delaunay(x,y) ;
trisurf(tri,x,y,z);
colorbar
shading interp ;

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MATLAB: Filtering coordinats, and marking them

'go' in plot means plot green circles at the data points with no lines connecting the data points. I don't know if you want the word "go" or if you want green circles. I don't know why you'd want the word go near every data point but if you do, follow Mischa's code. But the "1 unit length from (-1,-1)" is the thing I'm confused about. What does that mean? Do you want a scale bar in your plot, like a "micron bar" they use in microscopy images?

Your filter will select only those data points that fit in the box from -2 to 0 in the y direction and from -2 to 0 in the x direction. But you're using the wrong syntax. You need to do:

filterLogicalIndexes = -2<y & y<0 & -2<x & x < 0;
plot(x(filterLogicalIndexes ),y(filterLogicalIndexes ),'go', 'MarkerSize', 10, 'LineWidth', 2);

MATLAB: Contour from .xlsx, getting “Z must be at least a 2×2 matrix” error

You first need to convert you z vector into a grid to use contour()

data = xlsread('data.xlsx','Sheet1','A1:C300');
x = data(:,2);
y = data(:,1);
z = data(:,3);
xg = linspace(min(x), max(x), 50);
yg = linspace(min(y), max(y), 50);
[X,Y]=meshgrid(xg,yg);
Z = griddata(x, y, z, X, Y);
contour(X,Y,Z)

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Related Solutions

MATLAB: Filtering coordinats, and marking them

MATLAB: Contour from .xlsx, getting “Z must be at least a 2×2 matrix” error

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