Color Coding Data Points Using Scatter

Hi all,

I hope everyone is doing well!

I have a picture of my code, and am wanting to color code my thresholds according to colors of my choosing instead of the default RGB colors, as the RGB plot does not show the pattern of the data well.

I can not figure out how to make the points themselves the colors that I want, only how to divide them according to RGB colors. Does anyone have any advice on how to do this?

Answer 1

[Voss]

% random data
T = [10 25 40 50 75];
alldataoxides = struct( ...
    'pHs',3+9*rand(1,100), ...
    'kds',80*rand(1,100), ...
    'Temperature',T(randi(numel(T),1,100)));

% define your pH thresholds (i.e., bin edges)
pHs = [7.0, 9.1];

% define your colors (one for each bin -> one more color than you have thresholds)
colors = [ ...
    0.4 0   1; ...
    0   0.6 0.4; ...
    1   0.6 0; ...
    ];

% put -Inf and Inf on the ends to include the lowest and highest bins
bin_edges = [-Inf, pHs, Inf];

% bin_idx is which bin each pH value is in
bin_idx = discretize(alldataoxides.pHs,bin_edges);

% color matrix -> the color of each data point
colorIDb = colors(bin_idx,:)

colorIDb = 100×3

0.4000 0 1.0000 1.0000 0.6000 0 0.4000 0 1.0000 0.4000 0 1.0000 0.4000 0 1.0000 0.4000 0 1.0000 0.4000 0 1.0000 1.0000 0.6000 0 1.0000 0.6000 0 0 0.6000 0.4000

% scatter plot
sz = 50;
figure(7); hold on; box on;
scatter(alldataoxides.Temperature, log10(alldataoxides.kds), sz, colorIDb, 'filled')