casadi_densify.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 "densify"
template<typename T1, typename T2>
void casadi_densify(const T1* x, const casadi_int* sp_x, T2* y, casadi_int tr) {
  casadi_int nrow_x, ncol_x, i, el;
  const casadi_int *colind_x, *row_x;
  // Quick return - output ignored
  if (!y) return;
  nrow_x = sp_x[0]; ncol_x = sp_x[1];
  colind_x = sp_x+2; row_x = sp_x+ncol_x+3;
  // Zero out return value
  casadi_clear(y, nrow_x*ncol_x);
  // Quick return - input is zero
  if (!x) return;
  // Copy nonzeros
  if (tr) {
    for (i=0; i<ncol_x; ++i) {
      for (el=colind_x[i]; el!=colind_x[i+1]; ++el) {
        y[i + row_x[el]*ncol_x] = CASADI_CAST(T2, *x++);
      }
    }
  } else {
    for (i=0; i<ncol_x; ++i) {
      for (el=colind_x[i]; el!=colind_x[i+1]; ++el) {
        y[row_x[el]] = CASADI_CAST(T2, *x++);
      }
      y += nrow_x;
    }
  }
}