How to find where the differences between elements is constant?

So let's say these are my values:

 x y
 0  29
0  30
0  30
16760  30
16760  31
16760  31
16760  31
16760  31
16760  31
16760  32
16760  32
16760  32
16760  32
16760  33
16760  32
16760  33
16760  33
16760  33
16760  33
16760  33
16760  34
16760  34
16760  33
18330  34
18330  33
18330  35
19130  35
19130  35

what i need to know is for the periods that x is constant, the values of y (in my problem y is actually speed so i need the values to integrate and find distance afterwards)

so i would like to have as a result something like for x1=16760,y=30 31 31 31 31 31 32 32 32 32 33 32 33 33 33 33 33 34 34 33

x2=18330, y=34 33 35

x3=19130, y=35 35

etc..

Is that possible? any suggestion is welcome! thank you!

Answer 1

[Andrei Bobrov]

xy = [0      29
0      30
0      30
16760  30
16760  31
16760  31
16760  31
16760  31
16760  31
16760  32
16760  32
16760  32
16760  32
16760  33
16760  32
16760  33
16760  33
16760  33
16760  33
16760  33
16760  34
16760  34
16760  33
18330  34
18330  33
18330  35
19130  35
19130  35];

[a,~,c] = unique(xy(:,1));
out = [num2cell(a), accumarray(c,xy(:,2),[],@(x){x})];

[nath]

exactly! thank you very much!