if i have a 1-d ndarray, how do i assign values to it?

```
let mut results = Array1::<f64>::zeros((10));
results.iter_mut().enumerate().for_each(|(index, mut _row)| {
_row = &mut 3_f64;
println!("{:?}",_row);
// if index < length-1 {
// let first = index*big_in_small_terms;
// let last = first+big_in_small_terms;
// _row = &mut vec_of_closes[first..last].last().copied().unwrap();
// close = vec_of_closes[first..last].last().copied().unwrap();
// }
// else if index == length-1 && remainder > 0 {
// let first = index*big_in_small_terms;
// let last = first+remainder;
// _row = &mut vec_of_closes[first..last].last().copied().unwrap();
// }
// else if index == length-1 && remainder == 0 {
// _row = &mut close;
// }
});
```