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Questions tagged [rust-ndarray]

54 questions
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Elementary function math opereations for Rust ndarray arrays

I simply would like to do elementary math operations (e.g., sin, exp, log, sqrt ...) for Rust ndarray. However, I did not find any useful example for doing so from reading ndarray's documentations. Say, for example: extern crate ndarray; use…
null
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Good ways to deal with operations that return Result when using Ndarray

Recently I've started using ndarray to handle my multi-dimentional arrays when using Rust, and I love a lot of it's convenience features, if I could just figure out one problem, it would be perfect. Normally, when you collect an iterator over set a…
Nick Cosby
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Updating a row of a matrix in rust ndarray

I was looking to update a row of 2D matrix in rust ndarray, but row_mut does not seem to allow me to update the row directly. For example (playground link) let mut array = array![[1., 2.], [3., 4.]]; let y = array![5., 5.]; array.row_mut(0) +=…
Devil
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What's alternative for roll() in rust Ndarray crate?

There is a roll function in Numpy. But ndarray docs don't mention anything similar. I am trying to "roll" my array by an integer. For example let ar = arr2(&[[1.,2.,3.], [7., 8., 9.]]); calling numpy roll(ar, 1) would produce the desired…
Anatoly Bugakov
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Rust trait bound bloat / lack of inheritance

I'm trying to wrap the nalgebra and/or ndarray Rust crates into an abstract LinearOperator trait and corresponding AdjointableOperator etc. traits. The problem is that I get significant “trait bound bloat”, having to specify even internal…
497e0bdf29873
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What is the most efficient way to read the first line of a file separately to the rest of the file?

I am trying to figure out the best way to read the contents of a file. The problem is that I need to read the first line separately, because I need that to be parsed as a usize which I need for the dimension of a Array2 by ndarray. I tried the…
Martin Dagleish
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How to generate a random stochastic matrix or ndarray?

I was looking for a crate that would allow me to easily and randomly generate probability vectors, stochastic matrices or, in general, ndarrays that are stochastic. For people not familiar with these concepts, a probability vector v is defined as…
nbro
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Is there a more idiomatic way to do edge detection using ndarray?

Suppose I have an image represented as an Array2, for example: const SIZE: usize = 8; let image = Array2::from_elem((SIZE, SIZE), 0_u32); I want to obtain an Array2 that has true in all locations where at least one pixel (in a…
Thomas
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Rust ndarray: how to pass a slice as pointer array (&[T]) to function and mutable pointer array (&mut [T])?

I have a 3-dimensional array Array3 of the ndarray crate, and I would like to pass a slice of it as an array (&[T]) to a function, but can't figure out how. I found slice() and as_slice() methods, among similar others, but they require the data to…
Sergio Cavaleiro Costa
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Rust create non-contiguous vector for testing

I am using the ndarray::ArrayBase type, and for one of my unit tests I need to check whether or not a vector is contiguous in memory. I am using the .is_standard_layout() method to check this, so I just need a way to create vector for testing that…
stackoverflowing321
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What's the most efficient: a reference to an ArrayBase or an ArrayView?

I'm doing improvement on a Rust codebase that uses the ndarray crate to manipulate arrays. I have one question I could not find an explicit answer in the documentation. Is it more efficient to pass an instance of ArrayView as an argument to a…
RFTexas
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Rust ndarray: Mutating axis_iters

I am trying to implement somewhat "batched" matrix multiplication in rust using ndarray. Therefore I am trying to combine some .axis_iters and especially update a "result"-tensors Axis-iters accordingly. For me a problem occurs already when trying…
ginger314
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Rust get mutable reference to each element of an ndarray in parallel

I am working on a parallel matrix multiplication code in Rust, where I want to compute every element of the product in parallel. I use ndarrays to store my data. Thus, my code would be something alone the lines fn mul(lhs: &Array2, rhs:…
stomfaig
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How to remove element from 2D array in Rust

I need help making sense of Rust's ndarray remove_index() function. For example, I have a 3x3 two dimensional array: use ndarray::{arr2}; let mut arr = arr2([1, 2, 3], [4, 5, 6], [7, 8, 9]); I would like to…
mabalenk
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What does "v" stand for in ndarray (de)serialize?

I am trying to understand the "v" in ndarray (de)serialize: use ndarray::prelude::*; pub fn example() { let ar2 = arr2(&[[0., 0., 0., 0., 0.], [0., 0., 0., 0., 0.], [0., 0., 0., 0., 0.],[0., 0., 0., 0., 0.],[0., 0., 0., 0., 0.]]); let s =…
Anatoly Bugakov
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