Color Plot In Descending Order

Question

Sushmitha Kudari 2020-3-5

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https://ww2.mathworks.cn/matlabcentral/answers/509298-color-plot-in-descending-order

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 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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Answer 1

Sushmitha Kudari 2020-3-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/509298-color-plot-in-descending-order#answer_418776

在 MATLAB Online 中打开

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); 
 
 