Rust transforming a 2D-array to 1D array

Question

Does someone knows why x = df.select(["A"]).unwrap().to_ndarray::<Float64Type>().unwrap() is considered as a 2d array while I want it to be 1d array? Is there a function to reshape it to 1d array? Here the shape of y is (100, 1). The type of x is a ArrayBase<OwnedRepr<f64>, Dim<[usize; 2]>>

Answer 1

You Select a list of columns, the list having length 1. If the row count is say 100, then your resulting 2D-array has dimension (100, 1).