EMCEE

        [ADJUST\]EMCEE  [Data  Command]  [/BEGIN] [/BOUNDS Par Low Up [...]]
    [/LENGTH Length] [/PARAMETERS Va Vb Vc  ...]   [/START  A1  B1  C1  ...]
    [/STEP A2 B2 C2 ...]  [/WALKERS NWalk] [/ROOT_NAME Root]

                                ***************
    Foreword:  this  command  is a wrapper around the "emcee" Python module.
    Gildas must have been compiled with the Gildas-Python  binding  enabled,
    and  the  modules  "emcee" and "pickle" must be installed in your Python
    version.
                                ***************

    Prepare, begin or continue a Monte Carlo Markov Chain  using  the  EMCEE
    method.

    Command  is the command line which computes a Chi^2 function on your da-
    ta.  Typically, it is "@ my_chi2" where my_chi2 is  a  script  gathering
    all  necessary  computations.  The  resulting chi^2 must be put into the
    global variable EMCEE%CHI2

    Argument Data is unused so far.

    The command has 3 forms. Without argument, it can  accept  only  options
    /BEGIN  and  /LENGTH.  It  then begins or continues a previously defined
    MCMC chain.  With arguments, the /PARAMETER option must be present.  The
    EMCEE  command  then  defines all parameters for the MCMC chain, and op-
    tionally starts it if /BEGIN is present.