Density Plot Discrete Points

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Arian Arab
Arian Arab on 11 Dec 2015
Answered: Image Analyst on 12 Dec 2015
Hello everyone, I am plotting a discrete data set with the function imagesc(x,y,z). as you know this functions colors each point (x,y) with color z on squares of edge 1. my problem is that in my data set, x and y are not integers. for example (0.1,0.1,2) and (0.2,0.2,3), can anyone kindly help me and let me know what type of function i have to use to plot this data set? It is like a temperature density plot where you have the temperature at each position T(x,y), but x and y are not integers. Thanks a lot.

Answers (2)

Joseph Cheng
Joseph Cheng on 11 Dec 2015
Edited: Joseph Cheng on 11 Dec 2015
take a look at the Surface Plots of Nonuniformly Sampled Data section of and instead of mesh when plotting you can use imagesc() or surf and change view.
or if you can change the vector/array of z into a matrix you can define the unique values of x and y. (see below if the data is easily converted into a matrix)
x = -10:.1:10;
y = x;
[X Y]= meshgrid(x,y);
Z = X.^2+Y.^2;

Image Analyst
Image Analyst on 12 Dec 2015
You can use the function scatteredInterpolant() to estimate values on a regular grid from your scattered data located at various random locations. once you have that you can use imshow() to display your new image.

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