Objects in Python

Python Class: expr

A Python wrapper class for the inner GiNaC::ex object _expr.

• expr(i) contructor from an integer i.

• expr(s) constructor from a string s.

• nops() return the _expr.nops().

• op(i) return the _expr.op(i).

• let_op(i,e) update the inner ith item by _expr.let_op(i)=e.

• expand() return _expr.expand().

• normal() return _expr.normal().

• factor() return _expr.factor().

• series(s,o) return mma_series(_expr,s,o).

• subs(e) return _expr.subs(e).

• isSymbol() check the _expr is a Symbol.

• isVector() check the _expr is a Vector.

• isIndex() check the _expr is a Index.

• isPair() check the _expr is a Pair.

• isDGamma check the _expr is a DGamma.

• map(map_func) return the _expr.map(map_func), map_func is an object derived from MapFunction class.

Python Functions

• expand(e) is equivalent to e.expand().

• normal(e) is equivalent to e.normal().

• factor(e) is equivalent to e.factor().

• series(e,s,n) is equivalent to e.series(s,n).

• subs(e,es) is equivalent to e.subs(es).

• pow(e,n) return the power $e^{n}$.
• Symbol(s) return an expr object with _expr=HepLib::Symbol(s).

• Index(s) return an expr object with _expr=HepLib::FC::Index(s).

• Vector(s) return an expr object with _expr=HepLib::FC::Vector(s).

• SP(e1,e2) return an expr object with _expr=HepLib::FC::SP(e1._expr,e2._expr).

• GAS(e) return an expr object with _expr=HepLib::FC::GAS(e._expr).

• TR(e) return an expr object with _expr=HepLib::FC::TR(e._expr).

• form(e) return an expr object with _expr=HepLib::FC::form(e._expr).

Python call any HepLib function

• call(func_str,e) return an expr object with _expr=func(e._expr).

• call(func_str,[e1,e2,...]) return an expr object with _expr=func(e1,e2,...).

Python Class: Integral

• epN the requested $\epsilon$ order.
• epsN the requested $\epsilon^\prime$ order.
• verb the inner Verbose.

• Functions([e1,e2,...]) to assign the internal Functions or Propagators.

• Exponents([e1,e2,...]) to assign the internal Exponents.

• Evaluate() to evaluate the integral by Sector Decomposition, the Integral object itself holds the nummerical result.