Finding the index in two different arrays where values are closest

I have two arrays. I want to find the index in each of the arrays where each of them is closest.

In the below plot of two arrays, array a is closed to array b at a(8) and b(9) because a(8) and b(9) have the closest y-values to each other than any other two independent y values.

Another way of wording the question: At which index do the y-values of each array intersect? If there are no intersections, what is the y-value where they both come closest to, and what is the index position in each array for that y-value?

clear all
clc
close all

R1 = 12964;
R2 = 34447.2;
PRF1 = 4000;
PRF2 = 3500
c = 3e8;
n = 0:100;

Rtrue1 = R1 + n.*(c/(2*PRF1));
Rtrue2 = R2 + n.*(c/(2*PRF2));

plot(Rtrue1,'b.', 'MarkerSize',8);
hold on
plot(Rtrue2,'r.', 'MarkerSize',8);

Answer 1

[Sulaymon Eshkabilov]

The answer is a quite straightforward that is to find the minimum of differences between the two lines. E.g.:

DR = Rtrue1-Rtrue2;
Ans = min(DR);
IND = DR==Ans;
Rtrue1(IND)   % Solution
Rtrue2(IND)   % Solution

Answer 2

[madhan ravi]

Note: Not tested.

 ix = abs(a(:) - b(:).');
 [~, ID] = min(ix(:));
 [where_a, where_b] = ind2sub(size(ix), id)