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eigenvalues_3x3_cardano

qsm_core::utils::frangi

Function eigenvalues_3x3_cardano 

Source 
fn eigenvalues_3x3_cardano(
    a: f64,
    b: f64,
    c: f64,
    d: f64,
    e: f64,
    f: f64,
) -> (f64, f64, f64)
Expand description

Analytical eigenvalues of 3×3 symmetric matrix using Cardano’s method

Much faster than Householder+QL since it avoids eigenvector computation and uses a fixed number of operations (no iteration).

Matrix is: | a d e | | d b f | | e f c |

Returns eigenvalues (not sorted)