#### Find Function

The find function determines the indices of array elements that meet a given logical

condition. In its simplest form, find returns a column vector of indices. Transpose that

vector to obtain a row vector of indices. For example,

`k = find(isprime(A))'`

picks out the locations, using one-dimensional indexing, of the primes in the magic square.

```
k =
2 5 9 10 11 13
```

Display those primes, as a row vector in the order determined by k, with

```
A(k)
ans =
5 3 2 11 7 13
```

When you use k as a left-hand-side index in an assignment statement, the matrix structure

is preserved.

```
A(k) = NaN
A =
16 NaN NaN NaN
NaN 10 NaN 8
9 6 NaN 12
4 15 14 1
```