Function std_dev_2d 

pub fn std_dev_2d<T>(
    array: &ArrayView<'_, T, Ix2>,
    axis: Option<Axis>,
    ddof: usize,
) -> Result<Array<T, Ix1>, &'static str>
where
    T: Clone + Float + FromPrimitive,

Calculate the standard deviation of array elements (2D arrays)

Errors

Returns an error if the array is empty or variance calculation fails.

Panics

Panics if variance calculation panics.

Arguments

• array - The input 2D array
• axis - Optional axis along which to compute the std dev (None for global std dev)
• ddof - Delta degrees of freedom (default 0)

Returns

The standard deviation of the array elements

Examples

use ndarray::{array, Axis};
use scirs2_core::ndarray_ext::stats::std_dev_2d;

let a = array![[1.0, 2.0, 3.0], [4.0, 5.0, 6.0]];

// Global standard deviation
let global_std = std_dev_2d(&a.view(), None, 1).expect("Operation failed");
assert!((global_std[0] - 1.87082869339_f64).abs() < 1e-10);

// Standard deviation along axis 0 (columns)
let col_stds = std_dev_2d(&a.view(), Some(Axis(0)), 1).expect("Operation failed");
assert_eq!(col_stds.len(), 3);