change marker color based on the values

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), '*');

Answer 1

[Mathieu NOE]

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');

[Mathieu NOE]

maybe you prefer to fill the markers , :

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,'fill','Marker','s')
colorbar('vert');

% jet colors
CC = jet(numel(normV));
figure
scatter(B(:,1),B(:,2),S,CC,'fill','Marker','s')
colorbar('vert');

[Turbulence Analysis]

Thanks!!

[Mathieu NOE]

My pleasure !