Enum ndarray::SliceOrIndex

pub enum SliceOrIndex {
    Slice {
        start: isize,
        end: Option<isize>,
        step: isize,
    },
    Index(isize),
}

A slice (range with step) or an index.

See also the s![] macro for a convenient way to create a &SliceInfo<[SliceOrIndex; n], D>.

Examples

SliceOrIndex::Index(a) is the index a. It can also be created with SliceOrIndex::from(a). The Python equivalent is [a]. The macro equivalent is s![a].

SliceOrIndex::Slice { start: 0, end: None, step: 1 } is the full range of an axis. It can also be created with SliceOrIndex::from(..). The Python equivalent is [:]. The macro equivalent is s![..].

SliceOrIndex::Slice { start: a, end: Some(b), step: 2 } is every second element from a until b. It can also be created with SliceOrIndex::from(a..b).step_by(2). The Python equivalent is [a:b:2]. The macro equivalent is s![a..b;2].

SliceOrIndex::Slice { start: a, end: None, step: -1 } is every element, from a until the end, in reverse order. It can also be created with SliceOrIndex::from(a..).step_by(-1). The Python equivalent is [a::-1]. The macro equivalent is s![a..;-1].

Variants

Slice

A range with step size. Negative begin or end indexes are counted from the back of the axis. If end is None, the slice extends to the end of the axis.

Fields of Slice

start: isize
end: Option<isize>
step: isize

Index(isize)

A single index.

Methods

impl SliceOrIndex

pub fn is_slice(&self) -> bool

Returns true if self is a Slice value.

pub fn is_index(&self) -> bool

Returns true if self is an Index value.

pub fn step_by(self, step: isize) -> Self

Returns a new SliceOrIndex with the given step size (multiplied with the previous step size).

step must be nonzero. (This method checks with a debug assertion that step is not zero.)

Trait Implementations

impl Debug for SliceOrIndex

fn fmt(&self, __arg_0: &mut Formatter) -> Result

Formats the value using the given formatter.

impl PartialEq for SliceOrIndex

fn eq(&self, __arg_0: &SliceOrIndex) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, __arg_0: &SliceOrIndex) -> bool

This method tests for !=.

impl Eq for SliceOrIndex

impl Hash for SliceOrIndex

fn hash<__H: Hasher>(&self, __arg_0: &mut __H)

Feeds this value into the given [Hasher].

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given [Hasher].

impl Copy for SliceOrIndex

impl Clone for SliceOrIndex

fn clone(&self) -> Self

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Display for SliceOrIndex

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl From<Slice> for SliceOrIndex

fn from(s: Slice) -> SliceOrIndex

Performs the conversion.

impl From<isize> for SliceOrIndex

fn from(r: isize) -> SliceOrIndex

Performs the conversion.

impl From<Range<isize>> for SliceOrIndex

fn from(r: Range<isize>) -> SliceOrIndex

Performs the conversion.

impl From<RangeFrom<isize>> for SliceOrIndex

fn from(r: RangeFrom<isize>) -> SliceOrIndex

Performs the conversion.

impl From<RangeTo<isize>> for SliceOrIndex

fn from(r: RangeTo<isize>) -> SliceOrIndex

Performs the conversion.

impl From<usize> for SliceOrIndex

fn from(r: usize) -> SliceOrIndex

Performs the conversion.

impl From<Range<usize>> for SliceOrIndex

fn from(r: Range<usize>) -> SliceOrIndex

Performs the conversion.

impl From<RangeFrom<usize>> for SliceOrIndex

fn from(r: RangeFrom<usize>) -> SliceOrIndex

Performs the conversion.

impl From<RangeTo<usize>> for SliceOrIndex

fn from(r: RangeTo<usize>) -> SliceOrIndex

Performs the conversion.

impl From<i32> for SliceOrIndex

fn from(r: i32) -> SliceOrIndex

Performs the conversion.

impl From<Range<i32>> for SliceOrIndex

fn from(r: Range<i32>) -> SliceOrIndex

Performs the conversion.

impl From<RangeFrom<i32>> for SliceOrIndex

fn from(r: RangeFrom<i32>) -> SliceOrIndex

Performs the conversion.

impl From<RangeTo<i32>> for SliceOrIndex

fn from(r: RangeTo<i32>) -> SliceOrIndex

Performs the conversion.

impl From<RangeFull> for SliceOrIndex

fn from(_: RangeFull) -> SliceOrIndex

Performs the conversion.