casadi_rank1.hpp

//
//    MIT No Attribution
//
//    Copyright (C) 2010-2023 Joel Andersson, Joris Gillis, Moritz Diehl, KU Leuven.
//
//    Permission is hereby granted, free of charge, to any person obtaining a copy of this
//    software and associated documentation files (the "Software"), to deal in the Software
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// SYMBOL "rank1"
template<typename T1>
void casadi_rank1(T1* A, const casadi_int* sp_A, T1 alpha, const T1* x, const T1* y) {
  casadi_int ncol_A, cc, rr, el;
  const casadi_int *colind_A, *row_A;
  // Get sparsities
  ncol_A = sp_A[1];
  colind_A = sp_A+2; row_A = sp_A + 2 + ncol_A+1;
 
  // Loop over the columns of A
  for (cc=0; cc<ncol_A; ++cc) {
    // Loop over the nonzeros of A
    for (el=colind_A[cc]; el<colind_A[cc+1]; ++el) {
      // Get row
      rr = row_A[el];
 
      // Add the multiple
      A[el] += alpha*x[rr]*y[cc];
    }
  }
}