Finding minimum value from a graph

I have plotted a graph using the code below.

This produces a varied scatter graph. How would I find the minumum y value and then in turn find the corresponding x value to this?

dataset3 = FullData(1:100:end)';
plot(time_ms,dataset3); 
xlabel('Time(ms)');
ylabel('Displacement (mm)');
title('Results: 10V');
grid on

Answer 1

[Torsten]

[y_min,i_min] = min(dataset3)
x_min = time_ms(i_min)