Sherman-Morrison/tests/cMaponiA3_test_3x3_3.cpp

62 lines
1.6 KiB
C++

// main.cpp
#include "Helpers.hpp"
#include "SM_Maponi.hpp"
int main() {
unsigned int M = 3; // Dimension of the Slater-matrix
unsigned int i, j; // Indices for iterators
// Declare, allocate all vectors and matrices and fill them with zeros
unsigned int *Ar_index = new unsigned int[M];
double *A = new double[M * M]; // The matrix to be inverted
double *A0 =
new double[M * M]; // A diagonal matrix with the digonal elements of A
double *Ar = new double[M * M]; // The update matrix
double *A0_inv = new double[M * M]; // The inverse
// Fill with zeros
for (i = 0; i < M; i++) {
for (j = 0; j < M; j++) {
A0[i * M + j] = 0;
Ar[i * M + j] = 0;
A0_inv[i * M + j] = 0;
}
}
// Initialize A with M=3 and fill acc. to Eq. (17) from paper
A[0] = 1;
A[3] = 1;
A[6] = -1;
A[1] = 1;
A[4] = 1;
A[7] = 0;
A[2] = -1;
A[5] = 0;
A[8] = -1;
showMatrix(A, M, "A");
// Initialize the diagonal matrix A0,
// the inverse of A0_inv of diagonal matrix A0_inv
// and the update matrix Ar
for (i = 0; i < M; i++) {
A0[i * M + i] = A[i * M + i];
A0_inv[i * M + i] = 1.0 / A[i * M + i];
Ar_index[i] = i + 1; // ! First column needs to start with 1 !
for (j = 0; j < M; j++) {
Ar[i * M + j] = A[i * M + j] - A0[i * M + j];
}
}
// Define pointers dim and n_updates to use in Sherman-Morrison(...) function
// call
MaponiA3(A0_inv, M, M, Ar, Ar_index);
showMatrix(A0_inv, M, "A0_inv");
// Deallocate all vectors and matrices
delete[] A, A0, A0_inv, Ar, Ar_index;
return 0;
}