Output of a vector which excludes the entries of the second vector

Hello,

Problem: Given two distinct integer vectors p and q. I'd like to get a new vector r, that is p excluding the entries of q.

For example,

p = [1 2 3 4 5 6 7 8], q = [2 5 7 9], then r = [1 3 4 6 8].

Hope to have a code in a singer line. Thanks.

Answer 1

[Azzi Abdelmalek]

 p = [1 2 3 4 5 6 7 8],
 q = [2 5 7 9], 
 out=p(~ismember(p,q))

[Feng Cheng Chang]

Thank very much. It works perfectly. I can now apply it to update my recent submission at FEX.

[Azzi Abdelmalek]

I suggest Walter's answer

[Feng Cheng Chang]

Thanks for your suggestion.

Answer 2

[Walter Roberson]

r = setdiff(p, q);

[Feng Cheng Chang]

Thank very much. It also works perfectly as Azzi's answer.

[Walter Roberson]

Note that the two answers are slightly different, having to do with the ordering of the outputs if the first vector is not sorted. setdiff() also has a 'stable' option to get the outputs in the original order.

[Matt Fig]

Not in 2011b....