How to find the index of the first repeating value.

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I want to find the index of the first repeating value and plot a vertical line at that point, when the graph stabilizes.
a = [1,2,3,4,5,6,7,8,8,8,8,8,8,8,8,8,8,8,8]
b = linspace(0, 10, length(a));
plot(a,b)
%xline(b) exactly at the location where the values repeat in a.

Accepted Answer

Voss
Voss on 23 Jun 2022
Edited: Voss on 23 Jun 2022
a = [1,2,3,4,5,6,7,8,8,8,8,8,8,8,8,8,8,8,8];
b = linspace(0, 10, length(a));
% plot(a,b)
plot(b,a)
idx = find(diff(a) == 0, 1)
idx = 8
xline(b(idx))
ylim([0 10])

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