You said you want the first instance where the next number is larger, but the desired output you gave [1 12 22] is all instances where the next number is larger.
A = [0 5 1 0 1 2 3 4 0 1 0 1 0 1 0 1 2 3 4 0 1 0 1 0 1 1 2 3 4]
numtofind = 1;
% find all instances
% ignore the last element, since it has no following element
b = find(A(1:end-1)==numtofind)
% pick whichever type of result you need
%b = b(find(A(b)<A(b+1),1)) % the first instance where the next number is larger
b = b(A(b)<A(b+1)) % all instances where the next number is larger
Just pick whichever one you need.
