Need help to specify unique values of a vector

I am using the unique command to specify the unique values of a vector that i read from different files. While it works ok for some of them, there are a lot that after i keep just the "unique" values i discover that there are still same values. The code i use is the following

    idx=find(unique(Z));
    Z=Z(idx);

My problem is that i use the Z variable for interpolation later in my code, so if the values aren't dinstict i get error

Error using ==> interp1 at 261 The values of X should be distinct.

Thank you in advance

Answer 1

[Fangjun Jiang]

You probably didn't use the function right.

find() finds indices of nonzero elements. I don't know why you would run idx=find(unique(Z)).

unique() will return the unique values in Z, but it could also return the index. See the full help of unique().

[Kostas]

You are right, i should use something like [b,idx]=unique(Z) to get indices in idx not find. Thanks a lot