Function diag 

pub fn diag(diag: &[f64]) -> SparseResult<CsrMatrix<f64>>

Create a diagonal matrix in CSR format

Arguments

• diag - Vector of diagonal elements

Returns

• Diagonal matrix in CSR format

Example

use scirs2_sparse::utils::diag;

// Create a diagonal matrix with elements [1, 2, 3]
let d = diag(&[1.0, 2.0, 3.0]).unwrap();