opensrdk-linear-algebra 0.8.5

Standard linear algebra library using blas and lapack for OpenSRDK toolchain.
Documentation 
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use super::trf::GETRF;
use crate::matrix::ge::Matrix;
use crate::matrix::MatrixError;
use crate::number::c64;
use lapack::{dgetri, zgetri};

impl GETRF {
    /// # Inverse
    /// with matrix decomposed by getrf
    pub fn getri(self) -> Result<Matrix, MatrixError> {
        let GETRF(mut mat, ipiv) = self;

        let n = mat.rows();
        if n != mat.cols() {
            return Err(MatrixError::DimensionMismatch);
        }

        let mut work = vec![f64::default(); n];
        let mut info = 0;

        let n = n as i32;

        unsafe {
            dgetri(n, &mut mat.elems, n, &ipiv, &mut work, n, &mut info);
        }

        match info {
            0 => Ok(mat),
            _ => Err(MatrixError::LapackRoutineError {
                routine: "dgetri".to_owned(),
                info,
            }),
        }
    }
}

impl GETRF<c64> {
    /// # Inverse
    /// with matrix decomposed by getrf
    pub fn getri(self) -> Result<Matrix<c64>, MatrixError> {
        let GETRF::<c64>(mut mat, ipiv) = self;

        let n = mat.rows();
        if n != mat.cols() {
            return Err(MatrixError::DimensionMismatch);
        }

        let mut work = vec![c64::default(); n];
        let mut info = 0;

        let n = n as i32;

        unsafe {
            zgetri(n, &mut mat.elems, n, &ipiv, &mut work, n, &mut info);
        }

        match info {
            0 => Ok(mat),
            _ => Err(MatrixError::LapackRoutineError {
                routine: "zgetri".to_owned(),
                info,
            }),
        }
    }
}

#[cfg(test)]
mod tests {
    use crate::*;
    #[test]
    fn it_works() {
        let a = mat!(
            1.0, 2.0;
            3.0, 4.0
        );
        let result = a.clone().getrf().unwrap();
        let a_inv = result.getri().unwrap();
        let i = a * a_inv;
        let i2 = DiagonalMatrix::identity(2);
        let i3 = i2.mat();
        assert_eq!(i[(0, 0)], i3[(0, 0)]);
    }
}