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//
// GENERATED FILE
//
use super::*;
use crate::SpiceContext;
use f2rust_std::*;
/// Matrix times matrix, general dimension
///
/// Multiply two double precision matrices of arbitrary size.
///
/// # Brief I/O
///
/// ```text
/// VARIABLE I/O DESCRIPTION
/// -------- --- --------------------------------------------------
/// M1 I NR1 x NC1R2 double precision matrix.
/// M2 I NC1R2 x NC2 double precision matrix.
/// NR1 I Row dimension of M1 (and also MOUT).
/// NC1R2 I Column dimension of M1 and row dimension of M2.
/// NC2 I Column dimension of M2 (and also MOUT).
/// MOUT O NR1 x NC2 double precision matrix.
/// ```
///
/// # Detailed Input
///
/// ```text
/// M1 is any double precision matrix of arbitrary size.
///
/// M2 is any double precision matrix of arbitrary size.
/// The number of rows in M2 must match the number of
/// columns in M1.
///
/// NR1 is the number of rows in both M1 and MOUT.
///
/// NC1R2 is the number of columns in M1 and (by necessity)
/// the number of rows of M2.
///
/// NC2 is the number of columns in both M2 and MOUT.
/// ```
///
/// # Detailed Output
///
/// ```text
/// MOUT is a a double precision matrix of dimension
/// NR1 x NC2. MOUT is the product matrix given
/// by MOUT = (M1) x (M2). MOUT must not overwrite
/// M1 or M2.
/// ```
///
/// # Exceptions
///
/// ```text
/// Error free.
///
/// 1) If NC1R2 < 1, the elements of the matrix MOUT are set equal to
/// zero.
/// ```
///
/// # Particulars
///
/// ```text
/// The code reflects precisely the following mathematical expression
///
/// For each value of the subscript I from 1 to NC1, and J from 1
/// to NC2:
///
/// MOUT(I,J) = Summation from K=1 to NC1R2 of ( M1(I,K) * M2(K,J)
///
/// Since this subroutine operates on matrices of arbitrary size, it
/// is not feasible to buffer intermediate results. Thus, MOUT
/// should NOT overwrite either M1 or M2.
/// ```
///
/// # Examples
///
/// ```text
/// The numerical results shown for this example may differ across
/// platforms. The results depend on the SPICE kernels used as
/// input, the compiler and supporting libraries, and the machine
/// specific arithmetic implementation.
///
/// 1) Given a 3x2 and a 2x3 matrices, multiply the first matrix by
/// the second one.
///
///
/// Example code begins here.
///
///
/// PROGRAM MXMG_EX1
/// IMPLICIT NONE
///
/// C
/// C Local variables.
/// C
/// DOUBLE PRECISION M1 ( 3, 2 )
/// DOUBLE PRECISION M2 ( 2, 3 )
/// DOUBLE PRECISION MOUT ( 3, 3 )
///
/// INTEGER I
/// INTEGER J
///
/// C
/// C Define M1 and M2.
/// C
/// DATA M1 / 1.0D0, 2.0D0, 3.0D0,
/// . 4.0D0, 5.0D0, 6.0D0 /
///
/// DATA M2 / 1.0D0, 2.0D0,
/// . 3.0D0, 4.0D0,
/// . 5.0D0, 6.0D0 /
///
/// C
/// C Multiply M1 by M2.
/// C
/// CALL MXMG ( M1, M2, 3, 2, 3, MOUT )
///
/// WRITE(*,'(A)') 'M1 times M2:'
/// DO I = 1, 3
///
/// WRITE(*,'(3F10.3)') ( MOUT(I,J), J=1,3)
///
/// END DO
///
/// END
///
///
/// When this program was executed on a Mac/Intel/gfortran/64-bit
/// platform, the output was:
///
///
/// M1 times M2:
/// 9.000 19.000 29.000
/// 12.000 26.000 40.000
/// 15.000 33.000 51.000
/// ```
///
/// # Restrictions
///
/// ```text
/// 1) No error checking is performed to prevent numeric overflow or
/// underflow.
///
/// 2) No error checking performed to determine if the input and
/// output matrices have, in fact, been correctly dimensioned.
///
/// 3) MOUT should not overwrite M1 or M2.
/// ```
///
/// # Author and Institution
///
/// ```text
/// J. Diaz del Rio (ODC Space)
/// W.M. Owen (JPL)
/// W.L. Taber (JPL)
/// ```
///
/// # Version
///
/// ```text
/// - SPICELIB Version 1.1.0, 04-JUL-2021 (JDR)
///
/// Changed input argument names ROW1, COL1 and COL2 to NR1, NC1R2
/// and NC2 for consistency with other routines.
///
/// Added IMPLICIT NONE statement.
///
/// Edited the header to comply with NAIF standard.
/// Added complete code example based on the existing example.
///
/// - SPICELIB Version 1.0.1, 10-MAR-1992 (WLT)
///
/// Comment section for permuted index source lines was added
/// following the header.
///
/// - SPICELIB Version 1.0.0, 31-JAN-1990 (WMO)
/// ```
pub fn mxmg(m1: &[f64], m2: &[f64], nr1: i32, nc1r2: i32, nc2: i32, mout: &mut [f64]) {
MXMG(m1, m2, nr1, nc1r2, nc2, mout);
}
//$Procedure MXMG ( Matrix times matrix, general dimension )
pub fn MXMG(M1: &[f64], M2: &[f64], NR1: i32, NC1R2: i32, NC2: i32, MOUT: &mut [f64]) {
let M1 = DummyArray2D::new(M1, 1..=NR1, 1..=NC1R2);
let M2 = DummyArray2D::new(M2, 1..=NC1R2, 1..=NC2);
let mut MOUT = DummyArrayMut2D::new(MOUT, 1..=NR1, 1..=NC2);
let mut SUM: f64 = 0.0;
//
// Local variables
//
//
// Perform the matrix multiplication
//
for I in 1..=NR1 {
for J in 1..=NC2 {
SUM = 0.0;
for K in 1..=NC1R2 {
SUM = (SUM + (M1[[I, K]] * M2[[K, J]]));
}
MOUT[[I, J]] = SUM;
}
}
//
}