Plotting a column of a matrix as function of the others

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Diego Soler Polo 2018-6-4

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评论： Diego Soler Polo 2018-6-4

As the result of a computation, I have a Nx3 matrix (N is huge). The first column is called X, the second column is called Y and the third column is called Z. I want to plot Z as a function of X and Y, but there's no any particular order in the rows of the matrix and there might be repetitions. I would like to do two things:

1) Plot Z thridimensionally, as in a surface plot

2) Make a color map

How can I do this?

Thanks

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Answer 1

monika shivhare 2018-6-4

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https://ww2.mathworks.cn/matlabcentral/answers/403863-plotting-a-column-of-a-matrix-as-function-of-the-others#answer_323065

在 MATLAB Online 中打开

make a meshgrid using values of X and Y

[x,y] = meshgrid(X,Y);

make a surfaceplot

surf(x,y,Z)

refer to link surface plots

to make a colormap to the surfaceplot refer Change Color Scheme Using a Colormap

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Diego Soler Polo 2018-6-4

X and Y are so large (they have about 7 million components each) that this doesn't work (MATLAB cannot create the grid). Is there any other way around this?

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