How to give diferent colours to diferent values in a matrix?

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Inês Rodrigues 2016-10-26

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https://ww2.mathworks.cn/matlabcentral/answers/309217-how-to-give-diferent-colours-to-diferent-values-in-a-matrix

评论： Adam 2016-10-26

Hi! I have a 3d matrix of 0's and 1's. I would like to plot it with scatter3 with 0's showing up black and 1's showing up white. Is that possible?

Thank you, Inês

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Adam 2016-10-26

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编辑：Adam 2016-10-26

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scatter3(X,Y,Z,S,C)

The final argument there is a colour vector, of equal length to the X and Y vectors. If you don't care about the marker type you can pass in [] as the S argument.

I'm really sorry but I'm not understading. I have a 3d matrix with different values. I thresholded it in order to be only 0 and 1, like a mask. And now I want to visualize the result. So I want to have a 3d scatter plot with all my points, with 0's in black and 1's in white.

Adam 2016-10-26

在 MATLAB Online 中打开

So in that case you will have to create the X, Y and Z values first. The X, Y and Z vectors that scatter3 takes as its arguments represent the points that it will plot, so you need to create these vectors in such a way that they include every (x,y,z) triplet. You should be able to do this using

doc meshgrid

but a scatter plot doesn't really seem like a suitable way of displaying such regular data filling a grid. It is unlikely you will be able to interpret much off it.

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