MatNd_based.cpp

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#include "MatNd_based.h"

#include <Rcs_macros.h>
#include <Rcs_MatNd.h>

#include <algorithm>
#include <vector>


void MatNd_checkShapeEq(MatNd* m1, MatNd* m2)
{
    RCHECK_MSG((m1->m == m2->m) && (m1->n == m2->n),
               "Shape mismatch between two MatNds: %d x %d != %d x %d",
               m1->m, m1->n, m2->m, m2->n);
}


void findAllBitCombinations(MatNd* allComb)
{
    // Get the dimension
    size_t N = allComb->n;
    
    // Set all entries to 0. The first row will be used directly as a result
    MatNd_setZero(allComb);
    
    size_t i = 1;  // row index
    for (size_t k = 1; k <= N; k++) {
        std::vector<size_t> vec(N, 0);
        std::vector<size_t> currOnes(k, 1);
        // Set last k bits to 1
        std::copy(std::begin(currOnes), std::end(currOnes), std::end(vec) - k);
        
        // Get the combinations / permutations and set them into the matrix
        do {
            for (size_t v = 0; v < vec.size(); v++) {
                // Fill the current row
                MatNd_set2(allComb, i, v, vec[v]);
            }
            i++;
        } while (std::next_permutation(vec.begin(), vec.end()));  // returns false if no valid permutation was found
    }
}