SymEngine::Log Class Reference
+ Inheritance diagram for SymEngine::Log:
+ Collaboration diagram for SymEngine::Log:

Public Member Functions

void accept (Visitor &v) const override
void accept (EvalRealDoubleVisitorFinal &v) const override
 Log (const RCP< const Basic > &arg)
 Log Constructor.
bool is_canonical (const RCP< const Basic > &arg) const
RCP< const Basiccreate (const RCP< const Basic > &arg) const override
- Public Member Functions inherited from SymEngine::OneArgFunction
 OneArgFunction (const RCP< const Basic > &arg)
 The arg in OneArgFunction(arg) More...
hash_t __hash__ () const override
RCP< const Basicget_arg () const
vec_basic get_args () const override
 Returns the list of arguments.
RCP< const Basiccreate (const vec_basic &b) const
bool __eq__ (const Basic &o) const override
int compare (const Basic &o) const override
 Structural equality comparator.
- Public Member Functions inherited from SymEngine::Basic
TypeID get_type_code () const
 Basic ()
 Basic (const Basic &)=delete
 Delete the copy constructor and assignment.
Basicoperator= (const Basic &)=delete
 Assignment operator in continuation with above.
 Basic (Basic &&)=delete
 Delete the move constructor and assignment.
Basicoperator= (Basic &&)=delete
 Assignment operator in continuation with above.
hash_t hash () const
bool __neq__ (const Basic &o) const
 true if this is not equal to o. More...
int __cmp__ (const Basic &o) const
 Comparison operator.
std::string __str__ () const
std::string dumps () const
 Returns a string of the instance serialized.
RCP< const Basicsubs (const map_basic_basic &subs_dict) const
 Substitutes 'subs_dict' into 'self'.
RCP< const Basicxreplace (const map_basic_basic &subs_dict) const
virtual RCP< const Basicexpand_as_exp () const
 expands the special function in terms of exp function
RCP< const Basicdiff (const RCP< const Symbol > &x, bool cache=true) const
- Public Member Functions inherited from SymEngine::EnableRCPFromThis< Basic >
RCP< Basicrcp_from_this ()
 Get RCP<T> pointer to self (it will cast the pointer to T)
RCP< const Basicrcp_from_this () const
 Get RCP<const T> pointer to self (it will cast the pointer to const T)
RCP< const T2 > rcp_from_this_cast () const
 Get RCP<T2> pointer to self (it will cast the pointer to T2)
unsigned int use_count () const

Static Public Attributes

static const TypeID type_code_id = SYMENGINE_LOG

Additional Inherited Members

- Static Public Member Functions inherited from SymEngine::Basic
static RCP< const Basicloads (const std::string &)
 Creates an instance of a serialized string.
- Data Fields inherited from SymEngine::Basic
TypeID type_code_

Detailed Description

Definition at line 529 of file functions.h.

Member Function Documentation

◆ create()

RCP< const Basic > SymEngine::Log::create ( const RCP< const Basic > &  arg) const
canonicalized log

Implements SymEngine::OneArgFunction.

Definition at line 1769 of file functions.cpp.

1770 {
1771  return log(a);
1772 }
RCP< const Basic > log(const RCP< const Basic > &arg)
Returns the Natural Logarithm from argument arg
Definition: functions.cpp:1774

◆ is_canonical()

bool SymEngine::Log::is_canonical ( const RCP< const Basic > &  arg) const
true if canonical

Definition at line 1741 of file functions.cpp.

1742 {
1743  // log(0)
1744  if (is_a<Integer>(*arg) and down_cast<const Integer &>(*arg).is_zero())
1745  return false;
1746  // log(1)
1747  if (is_a<Integer>(*arg) and down_cast<const Integer &>(*arg).is_one())
1748  return false;
1749  // log(E)
1750  if (eq(*arg, *E))
1751  return false;
1753  if (is_a_Number(*arg) and down_cast<const Number &>(*arg).is_negative())
1754  return false;
1756  // log(Inf) is also handled here.
1757  if (is_a_Number(*arg) and not down_cast<const Number &>(*arg).is_exact())
1758  return false;
1760  // log(3I) should be expanded to log(3) + I*pi/2
1761  if (is_a<Complex>(*arg) and down_cast<const Complex &>(*arg).is_re_zero())
1762  return false;
1763  // log(num/den) = log(num) - log(den)
1764  if (is_a<Rational>(*arg))
1765  return false;
1766  return true;
1767 }
bool is_a_Number(const Basic &b)
Definition: number.h:130
bool eq(const Basic &a, const Basic &b)
Checks equality for a and b
Definition: basic-inl.h:21

Field Documentation

◆ type_code_id

const TypeID SymEngine::Log::type_code_id = SYMENGINE_LOG

Type_code_id shared by all instances

Definition at line 535 of file functions.h.

The documentation for this class was generated from the following files: