MATLAB: 2D color plot with 3 vectors

2d plot color

I have three vectors: x, y and z. Each (x(i), y(i)) coordinate corresponds to one z(i). I want to plot a 2D plot with x, y as axes and z denotes the colors. What should I do? Thanks a lot.

Best Answer

pointsize = 10;
scatter(x, y, pointsize, z)

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MATLAB: Plotting values with colormap of xy-plane

pcolor(X, Y, Z) is the same as surf(X, Y, Z, 'edgecolor', 'none') followed by view(90)

If your X and Y are consecutive integers starting from 1, then you could just

pcolor(Z)

Note that when you pcolor or surf, that the number of output "pixels" is one fewer in each direction than the number of rows or columns. surf determines the color of each pixel by interpolation from the four corner vertices.

If your X and Y are linear and equidistant, you could consider using

imagesc(X, Y, Z)

MATLAB: Plotting 3D graph .

You have two choices:

Create an hgtransform group. When you scatter3() or surf(), or patch(), exchange the Y and Z parameters, and set the Parent of the plot to be the hgtransform group. Set the transform matrix of the hgtransform group to exchange the Y and Z axes. Note that if you take this approach, datatips might perhaps have Y and Z exchanged. This technique cannot be used with plot3() because plot3() does not offer any option to color by depth or by point.
For surf() or patch(), pre-calculate the color you want each node to be according to whatever you choose, and set the CData property effectively to the image you texturemap on top of the surface or patch; warp() can make this process easier. For scatter3() pre-calculate the color you want each point to be according to whatever you choose, and pass the color in as the 5th argument (X, Y, Z, Pointsize, Color). This technique cannot be used with plot3() because plot3() does not offer any option to color by depth or by point.

Best Answer

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MATLAB: Plotting values with colormap of xy-plane

MATLAB: Plotting 3D graph .

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