#ifndef HAVE_USEFUL_FUNCTIONS_HH
#define HAVE_USEFUL_FUNCTIONS_HH
#ifdef __CPLUSPLUS
template <class class_t>
#else
#define inline // strip from pre-processed file
#define class_t double
#endif // __CPLUSPLUS
// == Template functions ==
inline class_t
max (const class_t &x1, const class_t &x2)
{
return ((x1 >= x2) ? x1 : (x1 < x2) ? x2 : 0);
}
inline class_t
min (const class_t &x1, const class_t &x2)
{
return ((x1 <= x2) ? x1 : (x1 > x2) ? x2 : 0);
}
inline class_t
sign (const class_t &x)
{
return ((x > 0) ? +1 : (x < 0) ? -1 : 0);
}
// == Octave functions ==
inline Matrix
ones (const int r = 1, const int c = 1)
{
Matrix m (r, c, 1.0);
return m;
}
inline ColumnVector
nozeros (const ColumnVector v0, const double tol = 0.0)
{
ColumnVector v (v0.length ());
register int i, j;
for (i = j = 0; i < v.length (); i++)
if (tol < abs (v0 (i)))
{
v (j) = v0 (i);
j++;
}
if (0 == j)
{
return *new ColumnVector ();
}
else
{
return (v.extract (0, --j));
}
}
inline ColumnVector
zeros (const int r)
{
ColumnVector v (r, 0.0);
return v;
}
inline Matrix
zeros (const int r, const int c)
{
Matrix m (r, c, 0.0);
return m;
}
#endif // HAVE_USEFUL_FUNCTIONS_HH