MathDAG::ConstantDAG Struct Reference

#include <equations.h>

Inheritance diagram for MathDAG::ConstantDAG:

Collaboration diagram for MathDAG::ConstantDAG:

Public Member Functions
	ConstantDAG (const string &value="0")
	ConstantDAG (double value)
int	BODMASlevel () const override
	algebraic heirarchy level, used for working out whether brackets are necessary. More...
int	order (unsigned maxOrder) const override
	returns evaluation order in sequence of variable defintions More...
bool	tensorEval (std::set< const Node *> &) const override
	returns true if the evaluation of this involves tensor processing More...
ostream &	latex (ostream &o) const override
	writes LaTeX representation of this DAG to the stream More...
ostream &	matlab (ostream &o) const override
	writes a matlab representation of this DAG to the stream More...
void	render (ecolab::cairo::Surface &surf) const override
	renders a visual representation of this node to surf graphic extends right from the current pen position (which needs to be defined), and pen is moved to the right edge of the graphic. The determine bounding box, render into a recording surface, and use width()/height() More...
VariableValuePtr	addEvalOps (EvalOpVector &, const VariableValuePtr &) override
	adds EvalOps to an EvalOpVector representing this node. More...
NodePtr	derivative (SystemOfEquations &) const override
	support for the derivative operator. More...
Public Member Functions inherited from MathDAG::Node
virtual	~Node ()
std::string	latexStr () const
std::string	matlabStr () const
bool	tensorEval ()
	returns true if the evaluation of this involves tensor processing More...
LaTeXManip	latex () const
	used within io streaming More...
MatlabManip	matlab () const

Public Attributes
string	value
Public Attributes inherited from MathDAG::Node
int	cachedOrder =-1
VariableValuePtr	result
	reference to where this node's value is stored More...

Detailed Description

Definition at line 156 of file equations.h.

Constructor & Destructor Documentation

ConstantDAG() [1/2]

MathDAG::ConstantDAG::ConstantDAG ( const string &  value = "0" )

inline

Definition at line 159 of file equations.h.

: value(value.length()? value: "0") {}

ConstantDAG() [2/2]

MathDAG::ConstantDAG::ConstantDAG ( double  value )

inline

Definition at line 160 of file equations.h.

: value(str(value)) {}

Member Function Documentation

addEvalOps()

VariableValuePtr MathDAG::ConstantDAG::addEvalOps ( EvalOpVector &  , const VariableValuePtr &  result  )

overridevirtual

adds EvalOps to an EvalOpVector representing this node.

Returns

a variable where the result is stored. If a flowVariable has been provided in result, that may be used directly, otherwise a copy operation is added to ensure it receives the result.

Implements MathDAG::Node.

Definition at line 58 of file equations.cc.

References minsky::doOneEvent(), minsky::minsky(), minsky::VariableValues::resetValue(), minsky::VariableType::tempFlow, minsky::VariableType::undefined, and minsky::Minsky::variableValues.

  {
    if (result->idx()<0)
      {
        VariableValues& values=minsky::minsky().variableValues;
        if (r->type()!=VariableType::undefined && r->isFlowVar())
          {
            result=r;
            // set the initial value of the actual variableValue (if it exists)
            auto v=values.find(result->valueId());
            if (v!=values.end())
              v->second->init(value);
          }
        else
          {
            result=VariableValuePtr(VariableType::tempFlow);
            result->allocValue();
          }
        result->init(value);
        values.resetValue(*result);
      }
    if (r->type()!=VariableType::undefined && r->isFlowVar() && r!=result)
      ev.emplace_back(EvalOpPtr(new TensorEval(r,result)));
    assert(result->idx()>=0);
    doOneEvent(true);
    return result;
  }

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BODMASlevel()

int MathDAG::ConstantDAG::BODMASlevel ( ) const

inlineoverridevirtual

algebraic heirarchy level, used for working out whether brackets are necessary.

Implements MathDAG::Node.

Definition at line 161 of file equations.h.

{return 0;}

derivative()

NodePtr MathDAG::ConstantDAG::derivative ( SystemOfEquations &  ) const

overridevirtual

support for the derivative operator.

Implements MathDAG::Node.

Definition at line 36 of file derivative.cc.

  {return se.derivative(*this);}

latex()

ostream& MathDAG::ConstantDAG::latex ( ostream &  ) const

inlineoverridevirtual

writes LaTeX representation of this DAG to the stream

Implements MathDAG::Node.

Definition at line 164 of file equations.h.

{return o<<value;}

matlab()

ostream& MathDAG::ConstantDAG::matlab ( ostream &  ) const

inlineoverridevirtual

writes a matlab representation of this DAG to the stream

Implements MathDAG::Node.

Definition at line 165 of file equations.h.

{return o<<value;}

order()

int MathDAG::ConstantDAG::order ( unsigned  maxOrder ) const

inlineoverridevirtual

returns evaluation order in sequence of variable defintions

Parameters

maxOrder

is used to limit the recursion depth

Implements MathDAG::Node.

Definition at line 162 of file equations.h.

{return 0;}

render()

void MathDAG::ConstantDAG::render ( ecolab::cairo::Surface &  surf ) const

overridevirtual

renders a visual representation of this node to surf graphic extends right from the current pen position (which needs to be defined), and pen is moved to the right edge of the graphic. The determine bounding box, render into a recording surface, and use width()/height()

Implements MathDAG::Node.

Definition at line 214 of file equationDisplayRender.cc.

References minsky::latexToPango(), and MathDAG::anonymous_namespace{equationDisplayRender.cc}::print().

  {
    print(surf.cairo(), latexToPango(value),Anchor::nw);
  }

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tensorEval()

bool MathDAG::ConstantDAG::tensorEval ( std::set< const Node *> &  visited ) const

inlineoverridevirtual

returns true if the evaluation of this involves tensor processing

Parameters

visited

set to break graph cycles

Implements MathDAG::Node.

Definition at line 163 of file equations.h.

{return false;}

Member Data Documentation

value

string MathDAG::ConstantDAG::value

Definition at line 158 of file equations.h.

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

• engine/equations.h
• engine/derivative.cc
• engine/equationDisplayRender.cc
• engine/equations.cc