I need to find Y values between two given points.

I have sets of x coordinates as follows (1527 2127, 2629 3229,...etc)

I need to find the Y values between each set then take all of those values and divide it by the number of sets.

This is an ECG signal and basically, I want to make a new plot which is an average of each cycle.

[Roger Stafford]

You need to define more precisely what you mean by the phrase "the Y values between each set". If your ECG signal is continuous, there will presumably be an infinite continuum of Y values lying between any two distinct Y values, assumed by the signal.

[Inteeskimo]

it's from a 10000x1 variable.

my x values are entries, for example, there are 10,000. The y values are some number.

I'm probably using the wrong language but I am an absolute beginner, but I hope it makes sense :)

[the cyclist]

Is x stored in a 10,000 x 2 array? Are the intervals defined by each row of x guaranteed to be disjoint from each other, with no overlap?

[Inteeskimo]

yes, there is no overlap. and the x values are just time in milliseconds (0 - 10,000) and y is in millivolts. each value of x corresponds with a value of y. I could do this manually by opening the variable and copying and pasting all the values between those sets and averaging them out. the sets are the values 200 and 400 milliseconds before and after each peak respectively.

Answer 1

[the cyclist]

Here is a small-scale example.

x = [1527 2127;
     2629 3229;
     4131 5555];

y = [2000;
     2100;
     3000;
     3100;
     5000];

y3 = reshape(y,1,1,[]);

intervalIndex3 = y3 > x(:,1) & y3 < x(:,2);

[intervalIndex,~,~] = ind2sub([size(x,1) 1 size(y,1)],find(intervalIndex3))

intervalIndex will tell you which row of x the value of y belongs to.