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#include <octave/oct.h>
#include "useful-functions.hh"
static inline int
result_ok (int info, double rcond, int warn = 1)
{
assert (info != -1);
if (info == -2)
{
if (warn)
warning ("matrix singular to machine precision, rcond = %g", rcond);
else
error ("matrix singular to machine precision, rcond = %g", rcond);
return 0;
}
else
return 1;
}
bool
mx_leftdiv_conform (const Matrix& a, const ColumnVector& b)
{
int a_nr = a.rows ();
int b_nr = b.length ();
if (a_nr != b_nr)
{
int a_nc = a.cols ();
int b_nc = 1;
gripe_nonconformant ("operator \\", a_nr, a_nc, b_nr, b_nc);
return false;
}
return true;
}
// need to update xdiv.cc ?
inline ColumnVector
ldiv (const Matrix &a, const ColumnVector &b)
{
if (! mx_leftdiv_conform (a, b))
return ColumnVector ();
int info;
if (a.rows () == a.columns ())
{
double rcond = 0.0;
ColumnVector result = a.solve (b, info, rcond);
if (result_ok (info, rcond))
return result;
}
int rank;
return a.lssolve (b, info, rank);
}
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{
if (0 != openx (i))
{
n--;
}
}
static ColumnVector tmp_dx (n);
static ColumnVector tmp_x (n);
static ColumnVector tmp_AAx (n);
static Matrix tmp_AA (n, n);
static Matrix tmp_dx (n,1);
static Matrix tmp_x (n,1);
static Matrix tmp_AAx (n,1);
static Matrix tmp_AA (n,n);
for (row_new = row_old = 0; row_old < Nx; row_old++)
{
if (0 == openx (row_old))
{
tmp_dx (row_new) = dx (row_old);
tmp_AAx (row_new) = AAx (row_old);
tmp_dx (row_new,0) = dx (row_old);
tmp_AAx (row_new,0) = AAx (row_old);
for (col_new = col_old = 0; col_old < Nx; col_old++)
{
if (0 == openx (col_old))
{
// xxx: this can be improved by symmetry
tmp_AA (row_new,col_new) = AA (row_old,col_old);
col_new++;
}
}
row_new++;
}
}
// can't get ldiv to work - doesn't like ColVector
// tmp_x = tmp_AA.pseudo_inverse () * tmp_AAx + t * tmp_dx;
tmp_x = ldiv (tmp_AA, (tmp_AAx + t * tmp_dx));
x (row_old) = tmp_x (row_new);
x (row_old) = tmp_x (row_new,0);
row_new++;
}
else
{
x (row_old) = 0.0;
}
}
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