ndarray: How to split an array?

Question

Looking for the functionality of the .split_of function as used with a Vec (https://doc.rust-lang.org/std/vec/struct.Vec.html#method.split_off)

Currently I am trying to use the function split_at: (docs: https://docs.rs/ndarray/0.13.1/ndarray/struct.ArrayBase.html#method.split_at)

Usage:

let mut data: Array2<f32> = array![[1.,2.],[3.,4.],[5.,6.],[7.,8.]];
let split = data.split_at(Axis(0),1);

Getting the error:

method not found in `ndarray::ArrayBase<ndarray::data_repr::OwnedRepr<{float}>, ndarray::dimension::dim::Dim<[usize; 2]>>`

What am I missing here?

Dimitris Fasarakis Hilliard · Accepted Answer · 2020-05-25 12:58:47Z

3

According to the documentation, these are defined only for ArrayViews and not Arrays.

It's unfortunate that this is stated right above split_at in the documentation, making it easy to miss if you simply click on it from the sidebar of methods.

Methods for read-only array views.

similarly for read-write views.

Initializing a view and splitting it as shown in split_at's documentation should work fine.

answered May 25, 2020 at 12:58

Dimitris Fasarakis Hilliard

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1 Comment

Jonathan Woollett-light Over a year ago

My concern about this is its memory usage, working with very large arrays, doubling memory usage is really not viable. Do you know the memory usage of this approach?

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