apply colour bar colours to data points

have made a hertzburg russel diagram, and want to overlay a color bar's colours onto my data points, and im not sure how. please advise.

my curret code:

data = readtable('hyg_v42.csv');


colorIndex = data.ci;    
luminosity = data.lum;  


valid = ~isnan(colorIndex) & ~isnan(luminosity);
colorIndex = colorIndex(valid);
luminosity = luminosity(valid);


figure;
scatter(colorIndex, luminosity, .25, 'Xcoulorbar'); 
set(gca, 'YScale', 'log');  



xlabel('Colour Index (B-V)');
ylabel('Luminosity (L/L_\odot)');
title('Hertzsprung–Russell Diagram (HYG Database)');
grid on;

xlim ([-0.5 2.5])
ylim ([10^-5 10^10])
c=colorbar
c.Location="southoutside"

Answer 1

[Star Strider]

The third and fourth arguments of scatter can control the size and colours of the plotted points. It is also necessary to define a colormap.

x = 0:10;
y = randn(size(x));

figure
scatter(x, y, 25, y, 'filled')
grid
colormap(turbo)
colorbar

●

A size argument of 0.25 might make the points too small to see.

.