change marker color based on the values

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Turbulence Analysis 2022-5-18

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评论： Mathieu NOE 2022-5-18

采纳的回答： Mathieu NOE

matlab.mat

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Hi,

I have a matrix B of 94859 x 3. In the the below command, I would like to change each individual marker color based on the data values stored in the B(:,3). Could somebody help me with this ??

plot (B(:,1),B(:,2), '*');

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Mathieu NOE 2022-5-18

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hello

my suggestions below

S = 35; % size of symbols in pixels
% normalize vector to go from zero to 1
normV = (B(:,3)-min(B(:,3)))./(max(B(:,3))-min(B(:,3)))
% blue to red. 
C = [normV zeros(size(normV)) 1-normV];
figure
scatter(B(:,1),B(:,2),S,C,'Marker','s')
colorbar('vert');
% jet colors
CC = jet(numel(normV));
figure
scatter(B(:,1),B(:,2),S,CC,'Marker','s')
colorbar('vert');