finding the mean and reducing the value

suppose i have a matrix x=[ 0.01 0.02 0.034 0.045 0.054 0.06]

and y=[1 1 1 2 1 1]

i want the output to be x1=[0.021 0.045 0.057] and y1=[1 2 1]

the number of elements in x and y are the same. whenever a repeating digit is encountered in the matrix y, the mean of the values in x for the number of reapeted values should be calculated and shown in x1 and the repeated values should be reduced to a single value and shown in y1

Answer 1

[Andrei Bobrov]

y = [1 1 1 2 1 1]';
x = [ 0.01  0.02  0.034  0.045  0.054  0.06]';

ii = [true;diff(y(:)) ~= 0];

x1 = accumarray(cumsum(ii),x,[],@mean);
y1 = y(ii);