I would like to mark the Minima of my colormap (scatter plot), because the Minima is not directly apparent.

%% Plot of the colormap %%

scatter(ff_r,ff_g,10,log10(save),'filled')

xlabel('Fill Factor RED [%]');

ylabel('Fill Factor Green [%]');

grid minor; xlim([0, 100]); ylim([0, 100]);

c = colorbar('eastoutside')

c.Label.String = 'Leistung: log_{10}(P) in [W/m^2]';

axis square;

colormap(cool(17))

how can I extra mark the Minima, for example with e red circle or crose...

I googled for help and found:

set(c, 'Ticks', sort([c.Limits, c.Ticks]))

But I would like to mark the minima and not the Ticks (whatever that should be..).

Answer 1

[Voss]

% some random data for demonstration:
ff_r = 100*rand(50,1);
ff_g = 100*rand(50,1);
saved_data = rand(50,1);
plotted_data = log10(saved_data);

% mark each point where plotted_data is at its minimum value
% with a red cross:
idx = plotted_data == min(plotted_data);
plot(ff_r(idx),ff_g(idx),'r+','LineWidth',1.5,'MarkerSize',8)
hold on

scatter(ff_r,ff_g,10,plotted_data,'filled')
xlabel('Fill Factor RED   [%]');
ylabel('Fill Factor Green [%]'); 
grid minor; xlim([0, 100]); ylim([0, 100]); 

c = colorbar('eastoutside');
c.Label.String = 'Leistung:     log_{10}(P)   in   [W/m^2]';
axis square; 
colormap(cool(17))