expmat.h

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// -*- C++ -*-
/*! \file
 *  \brief Exponentiate a SU(n) lie algebra element by some method,
 */
 
#ifndef __expmat_h__
#define __expmat_h__
 
namespace Chroma { 
 
enum ExpMat_t {EXP_EXACT, EXP_TWELFTH_ORDER};
 
//! Exponentiate a SU(n) lie algebra element by some method.
/*!
 * \ingroup gauge
 *
 * This routine is a driver for other routines. For example, expsu3
 * will exponentiate EFFICIENTLY an SU(3) matrix and, if desired,
 * check for errors in the truncation of the Taylor series.
 * The routine eesu3 EXACTLY exponentiates a SU(3) matrix. 
 *
 *  \param a        LatticeColorMatrix          (Modify)
 *  \param opt      Method of exponentiation    (Read)
 */
 
void expmat(LatticeColorMatrix& a,
            ExpMat_t opt);
 
  namespace ExpMatEnv {
    extern double getTime();
  }
}
 
#endif