mirror of
https://github.com/TREX-CoE/Sherman-Morrison.git
synced 2024-08-25 14:41:45 +02:00
130 lines
3.2 KiB
C++
130 lines
3.2 KiB
C++
// SM_Helpers.hpp
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// Some usefull helper functions to support the Maponi algorithm.
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#include <cmath>
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#include <cstring>
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#include <iostream>
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#include <string>
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// #define DEBUG
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#ifndef THRESHOLD
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#define THRESHOLD 1e-3
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#endif
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double threshold();
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void Switch(unsigned int *p, unsigned int l, unsigned int lbar);
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void selectLargestDenominator(unsigned int l, unsigned int N_updates,
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unsigned int *Updates_index, unsigned int *p,
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double ***ylk);
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template <typename T> void showScalar(T scalar, std::string name) {
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std::cout << name << " = " << scalar << std::endl << std::endl;
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}
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template <typename T>
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void showVector(T *vector, unsigned int size, std::string name) {
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std::cout << name << " = " << std::endl;
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for (unsigned int i = 0; i < size; i++) {
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std::cout << "[ " << vector[i] << " ]" << std::endl;
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}
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std::cout << std::endl;
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}
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template <typename T>
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void showMatrix(T *matrix, unsigned int M, std::string name) {
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std::cout.precision(17);
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std::cout << name << " = [" << std::endl;
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for (unsigned int i = 0; i < M; i++) {
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std::cout << "[";
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for (unsigned int j = 0; j < M; j++) {
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if (matrix[i * M + j] >= 0) {
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std::cout << " " << matrix[i * M + j] << ",";
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} else {
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std::cout << " " << matrix[i * M + j] << ",";
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}
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}
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std::cout << " ]," << std::endl;
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}
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std::cout << "]" << std::endl;
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std::cout << std::endl;
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}
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template <typename T> T *transpose(T *A, unsigned int M) {
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T *B = new T[M * M];
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for (unsigned int i = 0; i < M; i++) {
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for (unsigned int j = 0; j < M; j++) {
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B[i * M + j] = A[i + j * M];
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}
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}
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return B;
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}
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template <typename T> void matMul(T *A, T *B, T *C, unsigned int M) {
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memset(C, 0, M * M * sizeof(T));
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for (unsigned int i = 0; i < M; i++) {
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for (unsigned int j = 0; j < M; j++) {
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for (unsigned int k = 0; k < M; k++) {
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C[i * M + j] += A[i * M + k] * B[k * M + j];
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}
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}
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}
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}
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template <typename T1, typename T2>
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T1 *outProd(T1 *vec1, T2 *vec2, unsigned int M) {
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T1 *C = new T1[M * M];
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for (unsigned int i = 0; i < M; i++) {
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for (unsigned int j = 0; j < M; j++) {
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C[i * M + j] = vec1[i + 1] * vec2[j];
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}
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}
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return C;
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}
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template <typename T> T matDet(T **A, unsigned int M) {
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int det = 0, p, h, k, i, j;
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T **temp = new T *[M];
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for (int i = 0; i < M; i++)
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temp[i] = new T[M];
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if (M == 1) {
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return A[0][0];
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} else if (M == 2) {
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det = (A[0][0] * A[1][1] - A[0][1] * A[1][0]);
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return det;
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} else {
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for (p = 0; p < M; p++) {
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h = 0;
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k = 0;
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for (i = 1; i < M; i++) {
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for (j = 0; j < M; j++) {
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if (j == p) {
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continue;
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}
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temp[h][k] = A[i][j];
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k++;
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if (k == M - 1) {
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h++;
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k = 0;
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}
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}
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}
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det = det + A[0][p] * pow(-1, p) * matDet(temp, M - 1);
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}
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return det;
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}
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delete[] temp;
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}
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template <typename T> bool is_identity(T *A, unsigned int M, double tolerance) {
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for (unsigned int i = 0; i < M; i++) {
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for (unsigned int j = 0; j < M; j++) {
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if (i == j && fabs(A[i * M + j] - 1) > tolerance)
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return false;
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if (i != j && fabs(A[i * M + j]) > tolerance)
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return false;
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}
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}
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return true;
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}
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