Color Plot In Descending Order

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Sushmitha Kudari
Sushmitha Kudari 2020-3-5
回答： Sushmitha Kudari 2020-3-5
I have a matrix such as [x1 y1 z1; x2 y2 z2 ... xn yn zn]. I am plotting it as follows
ptCloud = pointCloud(plot_mat);
How can I add on a color matrix (in grayscale) such that the max z value is white and lowest color value is black. So far I have tried to use a colormap but the colormap only does concentration of points and not min and max.
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Image Analyst
Image Analyst 2020-3-5
编辑：Image Analyst 2020-3-5
Please attach plot_mat in a .mat file so people can try some things. In the meantime, try the caxis() function.

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Sushmitha Kudari
Sushmitha Kudari 2020-3-5
canyon = load('INIT.MAT')
topo = canyon.siocanyon;
%%%%%%%%%%%%%load with Munk profile%%%%%%%%%%%%%%%%%%%%
munkProfile = load('MunkS_500Hz.shd.mat');
pressureWave = munkProfile.pressure;
pressureWave = abs(pressureWave);
squished = squeeze(pressureWave);
logged = log(squished);
[X,Y]=ndgrid(1:size(logged,1),1:size(logged,2 ));
Z = ones(size(logged));
plot_mat = [X(:) Y(:) logged(:)];
[remove, ~] = find(plot_mat(:,3) == -Inf);
plot_mat(remove,:) = [];
ptCloud = pointCloud(plot_mat);
figure
pcshow(ptCloud);
cmap = colormap(gray);
Here is what I have tried. Init file is linked here.

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