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MatrixFunctions: Clean up StemFunction.h

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This commit is contained in:
Jitse Niesen
2013-07-26 13:51:10 +01:00
parent 75edc7cc8b
commit e43934d60f
3 changed files with 96 additions and 84 deletions
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170
unsupported/Eigen/src/MatrixFunctions/StemFunction.h
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@@ -12,93 +12,105 @@
namespace Eigen {
/** \ingroup MatrixFunctions_Module
* \brief Stem functions corresponding to standard mathematical functions.
*/
namespace internal {
/** \brief The exponential function (and its derivatives). */
template <typename Scalar>
class StdStemFunctions : internal::noncopyable
Scalar stem_function_exp(Scalar x, int)
{
public:
using std::exp;
return exp(x);
}
/** \brief The exponential function (and its derivatives). */
static Scalar exp(Scalar x, int)
{
return std::exp(x);
}
/** \brief Cosine (and its derivatives). */
template <typename Scalar>
Scalar stem_function_cos(Scalar x, int n)
{
using std::cos;
using std::sin;
Scalar res;
/** \brief Cosine (and its derivatives). */
static Scalar cos(Scalar x, int n)
{
Scalar res;
switch (n % 4) {
case 0:
res = std::cos(x);
break;
case 1:
res = -std::sin(x);
break;
case 2:
res = -std::cos(x);
break;
case 3:
res = std::sin(x);
break;
}
return res;
}
switch (n % 4) {
case 0:
res = std::cos(x);
break;
case 1:
res = -std::sin(x);
break;
case 2:
res = -std::cos(x);
break;
case 3:
res = std::sin(x);
break;
}
return res;
}
/** \brief Sine (and its derivatives). */
static Scalar sin(Scalar x, int n)
{
Scalar res;
switch (n % 4) {
case 0:
res = std::sin(x);
break;
case 1:
res = std::cos(x);
break;
case 2:
res = -std::sin(x);
break;
case 3:
res = -std::cos(x);
break;
}
return res;
}
/** \brief Sine (and its derivatives). */
template <typename Scalar>
Scalar stem_function_sin(Scalar x, int n)
{
using std::cos;
using std::sin;
Scalar res;
/** \brief Hyperbolic cosine (and its derivatives). */
static Scalar cosh(Scalar x, int n)
{
Scalar res;
switch (n % 2) {
case 0:
res = std::cosh(x);
break;
case 1:
res = std::sinh(x);
break;
}
return res;
}
switch (n % 4) {
case 0:
res = std::sin(x);
break;
case 1:
res = std::cos(x);
break;
case 2:
res = -std::sin(x);
break;
case 3:
res = -std::cos(x);
break;
}
return res;
}
/** \brief Hyperbolic cosine (and its derivatives). */
template <typename Scalar>
Scalar stem_function_cosh(Scalar x, int n)
{
using std::cosh;
using std::sinh;
Scalar res;
switch (n % 2) {
case 0:
res = std::cosh(x);
break;
case 1:
res = std::sinh(x);
break;
}
return res;
}
/** \brief Hyperbolic sine (and its derivatives). */
static Scalar sinh(Scalar x, int n)
{
Scalar res;
switch (n % 2) {
case 0:
res = std::sinh(x);
break;
case 1:
res = std::cosh(x);
break;
}
return res;
}
/** \brief Hyperbolic sine (and its derivatives). */
template <typename Scalar>
Scalar stem_function_sinh(Scalar x, int n)
{
using std::cosh;
using std::sinh;
Scalar res;
switch (n % 2) {
case 0:
res = std::sinh(x);
break;
case 1:
res = std::cosh(x);
break;
}
return res;
}
}; // end of class StdStemFunctions
} // end namespace internal
} // end namespace Eigen