Referencing variables in an array

Very novice MATLAB user. I have a matrix and a function that includes the rows to delete. How do I delete those rows referencing the function?

This is what I have:

x = find(final_allocation~= 0);

rowdrop = preferences(:,1) == [x];

preferences(rowdrop,:) = []

---

x = [1 2 4]

preferences =

2 7 9 6 5 4 1 3 8

4 6 1 9 5 3 2 7 8

4 2 6 7 9 5 3 8 1

1 5 2 3 9 4 7 8 6

3 8 6 9 2 4 1 7 5

7 8 1 2 4 6 3 9 5

2 4 3 1 8 9 7 6 5

5 1 2 9 4 7 8 3 6

6 1 8 5 2 9 4 7 3

I want to delete rows 1, 2, and 4 using variable x.

Answer 1

[Fangjun Jiang]

If you want to remove the [1 2 4]th row of a matrix

x=[1 2 4];
a=magic(6);
a(x,:)=[];