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Man Pages


Manual Reference Pages  -  MATH::EXPR::OPP (3)

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NAME



  Math::Expr::Opp - Represents one operation in the parsed expression
                    tree



CONTENTS

SYNOPSIS



  require Math::Expr::Opp;
  require Math::Expr::Var;
  require Math::Expr::Num;
 
  # To represent the expression "x+7":
  $n=new Math::Expr::Opp("+");
  $n->SetOpp(0,new Math::Expr::Var("x"));
  $n->SetOpp(1,new Math::Expr::Num(7));
  print $n->tostr . "\n";



DESCRIPTION



  Used by the Math::Expr to represent algebraic expressions. This class
  represents one operation or function with a set of operands, which
  in turn can be other Math::Expr::Opp objects. And in that way we are
  able to represent entire expression.

  Operations like a+b and functions like sin(a) or f(a,b) are all
  represented by this kind of objects with "+", "sin" and "f" as the
  operation- or function names and Math::Expr::Var(a) and
  Math::Expr::Var(b) as operands (only a in the sin example).



METHODS

CW$e=new Math::Expr::Opp($name,$db)



  Creates a new operation object with the operation- or function-name
  $name. Using the operations defined in $db. See
  L<Math::Expr::OpperationDB> for more info.



CW$e->SetOpp($i, CW$v)



  Sets operand number $i to $v.



CW$e->Opp($i)



  Returns operand to number $i.



CW$e->tostr



  Returns a string representation of the entire expression to be
  used for debugging.



CW$e->strtype



  Returns a string representation of this expressions entire type,
  without simplifying it. In the same notation as the tostr method.



CW$n->Simplify



  Simplifys the expression to some normal from.



CW$n->BaseType



  Returns a string type of this expression simplifyed as much as
  possible.



CW$n->SubMatch($rules,$match)



  Tries to match $rules to this expretions and adds the substitutions
  needed to $match.Returns 1 if the match excists and the substitutions
  needed can coexcist with those already in $match otherwise 0.



CW$n->Match($rules)



  Tries to match $rules to this expretions and to all its subexpretions.
  Returns a MatchSet object specifying where the matches ocored and what
  substitutions they represent.



CW$n->Subs($vars)



  Substitues all variables in the expretion with there vaules in $vars.



CW$n->Copy

Returns a copy of this object.

CW$n->Breakable



  Used by the parser to indikate if this object was created using
  parantesis or if he should break it up to preserve the rules of order
  between the diffrent opperations.



CW$n->Find($pos)



  Returns an object pointer to the subexpression represented by the
  string $pos.



CW$n->Set($pos, CW$val)



  Replaces the subexpression at position $pos with $val.



AUTHOR



  Hakan Ardo <hakan@debian.org>



SEE ALSO



  L<Math::Expr>



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perl v5.20.3 EXPR::OPP (3) 1998-09-01

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