MATLAB: Color Map for 3 column data

color maps

I have a data file which contains 3 columns – x, y and z. x and y correspond to atom number and position respectively. z corresponds to a calculated quantity. A portion of the file is as shown –

1 7.150846 0.00261065

2 9.901863 0.0150778

3 7.964226 0.0448227

4 7.107278 0.304756

I want to make a color plot in which the position of each atom is colored according to the value in z axis. Can someone please help me with this..

Thanks

Best Answer

data = [1 7.150846 0.00261065
2 9.901863 0.0150778
3 7.964226 0.0448227
4 7.107278 0.304756] ;
x = data(:,1) ; y = data(:,2) ; z = data(:,3) ;
scatter(x,y,50,z,'filled')
colorbar

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MATLAB: 3D plotting help

Per the documentation for scatter3,

scatter3(X,Y,Z,S,C) draws each circle with the color specified by C.

If C is a RGB triplet or character vector or string containing a color name, then all circles are plotted with the specified color.
If C is a three column matrix with the number of rows in C equal to the length of X, Y, and Z, then each row of C specifies an RGB color value for the corresponding circle.
If C is a vector with length equal to the length of X, Y, and Z, then the values in C are linearly mapped to the colors in the current colormap.

For your case, you want the second option of the three, what you tried was the first.

C=[1 0 0;0 1 0;0 1 0;0 0 1];
hSc=scatter3(x,y,z,20,C);

You can, of course, write logic to create the appropriate C array based on the data rather than hardcoding as shown.

MATLAB: Derivative of a function

(z - z1).*(z - z2).*(z - z3).*(z - z4) + (z - z1).*(z - z2).*(z - z3).*(z - z5) + (z - z1).*(z - z2).*(z - z4).*(z - z5) + (z - z1).*(z - z3).*(z - z4).*(z - z5) + (z - z2).*(z - z3).*(z - z4).*(z - z5)

Best Answer

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MATLAB: 3D plotting help

MATLAB: Derivative of a function

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