Advertisements I am trying to split a dataset into two separate ones by finding its minimum point in the first column. I have used idxmin to firstly identify the location of the minimum entry and secondly iloc to slice the array from 0 to the minimum point. The error I encounter is: TypeError: cannot do… Read More How to split an array using it's minimum entry

Advertisements Does the slice method iterate over the entire array? For example here I check what index and stop map when its on 4-th element. Do I have to do like that or is it better to just slice the array? {data?.map((direction, i) => { if (i === 4) { return; } return ( <Link… Read More Does the slice method iterate over the entire array?

Advertisements I’m trying to better understand Rust’s raw pointers, and I thought the following code would fail (sorry for possible UB) [Playground]: fn main() { println!("size of * const u32 ->{}", std::mem::size_of::<* const u32>()); println!("size of * const [u32;13] ->{}", std::mem::size_of::<* const [u32;13]>()); println!("size of * const [u32] ->{}", std::mem::size_of::<* const [u32]>()); let x =… Read More Raw pointer of array and pointer of slice in Rust

Advertisements as the title says Im trying to swap the position of item on a list. Like this: A = [1,2,3,4,5,6] #original list i,k,j,w = [0,2,3,6] #indexes A[i:k], A[j:w] = A[j:w], A[i:k] #expected A: [4,5,6,3,1,2] print(A) A: [4,5,6,1,2,6] #six is repeated and I`ve lost the item 3. I have tried things like: A[i:k+1], A[j:w-1] =… Read More swap sublist of different length in python

Advertisements In the documentation of the unsafe.SliceData function in go, it says: SliceData returns a pointer to the underlying array of the argument slice. If cap(slice) > 0, SliceData returns &slice[:1][0]. What’s the logic behind returning &slice[:1][0] instead of &slice[0]? As far as I’m aware (and my tests confirm), both would return the same address.… Read More slice[:1][0] vs slice[0] in go

Advertisements How do I convert an iterator that returns Strings to something that I can pass into a function that takes &[&str]? I’m trying to map the iterator to an iterator over &strs, but I get an error: error[E0515]: cannot return reference to function parameter `s` –> src/main.rs:89:52 | 89 | let args: Vec<&str> =… Read More Rust convert iterator over String to &[&str]

Advertisements I have a dataframe like below : time power speed state 1 14.00 29 3 1 2 14.01 30 3 2 3 14.02 29 3 3 4 14.03 30 3 4 5 14.04 29 3 5 6 14.05 30 3 6 7 14.06 29 3 6 8 14.07 30 3 6 9 14.08 29… Read More Slicing and extracting from dataframe

Advertisements I want to return a slice of my vector, but the compiler is complaining that &[Letter] needs an explicit lifetime. struct Board { board: Vec<Letter>, width: usize, height: usize, } impl std::ops::Index<usize> for Board { type Output = &[Letter]; fn index(&self, index: usize) -> &Self::Output { return &&self.board[index * self.width..(index + 1) * self.width];… Read More How to return slice of a vector in a struct

Advertisements I was surprised to read here that "The start and step arguments default to None", since it also says: slice(start, stop, step=1) "Return a slice object representing the set of indices specified by range(start, stop, step)." So I expected the default argument value for the step parameter to be 1. I know that slice(a,… Read More slice(start, stop, None) vs slice(start, stop, 1)

Advertisements I’m looking for a function with a signature similar to: split_header_and_tail(buf: &[u8]) -> Option<(&[u8; HEADER_LENGTH], &[u8])> If the supplied slice is too short, the result is None, but if it’s long enough a reference to the first HEADER_LENGTH bytes and the tail slice are returned. The first part must be a reference to a… Read More How to split a slice into a header array reference and a tail slice?