v0.7

New in 0.7

• WARNING: changed the multi channel map function interface. This function must now also accept a vector of enabled channels

v0.6

New in 0.6:

• added functionality to accumulate the results of distributions together with
  the integrated results
• changed the interfaces of functions that return accumulated results
• WARNING: removed the parameters() function in hep::projector
• added the possibility to use Meson for building/installing hep-mc

v0.5

New in 0.5:

• fixed a bug that caused NaNs to slip through to the integrated result if they
  were coming from the point's weight
• it is now possible to disable channels by setting their weight to zero
• the function multi_channel_verbose_callback now prints an overview of the
  smallest and largest a-priori weights
• the functions multi_channel and mpi_multi_channel now accept an
  optional parameter min_calls_per_channel that limits the a-priori weights
  to a smallest weight determined by a minimum number of calls. If set to zero
  (the default), this corresponds to the old behavior
• WARNING: this version introduces many interface changes; if you used previous
  version of this library you must update your code accordingly
• implemented lazy evaluation of the weight for the multi channel integrator.
  This required to change the interface of the map function which now must
  accept an additional parameter action that determines whether the
  coordinates or the densities must be calculated. This in turn enables
  the algorithm to skip the evaluation of densities when the integrand
  returns a zero value
• changed name of density_function() in hep::multi_channel_point to
  map()
• when calling the integration algorithms the numeric type must no longer be
  explicitly specified. The type information is now infered from the integrand
• renamed the class vegas_iteration_result to vegas_result
• completely changed the interfaces of all integrators; the functions that are
  integrated must now be specified by using an hep::integrand or
  hep::multi_channel_integrand which are obtained by using
  hep::make_integrand or hep::make_multi_channel_integrand. This allows
  the library to support the generation of differential distributions for all
  integrators. If distributions should be generated, the integrands must accept
  a second parameter, a reference to hep::projector, that takes care of the
  binning. The results of the distributions are captured in a
  hep::distribution_result for each distribution
• hep::plain now returns a hep::plain_result which contains the results
  for possibly generated distributions
• all _result classes except hep::mc_result derive now from
  hep::plain_result
• encapsulated all members of the class mc_point and classes deriving from
  it
• WARNING: interface changes to the class mc_point and all deriving classes;
  the member function does no longer include the averaging factor 1/N where N is
  the number of calls. If you used this member variable before, you MUST CHANGE
  YOUR CODE accordingly

v0.4

• added multi channel MC integrator with example
• added multi channel MC integrator with example
• added a new MC helper function hep::multi_channel_max_difference that
  calculates the maximum difference for adaptive optimization in multi channel
  MC
• added callbacks for multi channel MC analogous to the case for VEGAS
• added MPI parallelized routines for multi channel MC
• added new internal class hep::kahan_accumulator. This class takes care of
  the kahan summation
• changed interfaces mc_result and vegas_iteration_result: Their member
  variables are now properly encapsulated and accessible via public member
  functions. Furthermore, the mc_result now allows to obtain sum(),
  sum_of_squares(), and variance()

v0.3

• fixed compilation error
• removal of the hep::mpi_single_generator function. This is now on by
  default - the integration results are independent of the number of processes
• temporary fix for single-precision floating point numbers that are 1.0f
  and therefore outside of the half-open interval [0,1)
• changed hep::vegas_pdf interface to use more descriptive member function
  names and moved the member function icdf outside the class
• revamped documentation
• changed function names of hep::cumulative_result and
  hep::chi_square_dof to the same names with a 0 and 1 at the end
  of their names; 0 uses the same algorithm as before, 1 weighs all
  results equally. The function hep::cumulative_result remains but requires
  an additional argument
• added new global configuration function hep::vegas_cuba_refinement()
  that can be used to modify pdf refinement to use CUBA's method
• removed --enable-tests configure switch. All external dependecies are
  gone and running make check is sufficient now to run tests
• changed interfaces hep::cumulative_result and hep::chi_square_dof
  which no longer need to be called with the numeric type; the type is
  automatically determined by the iterators
• support for MPI can now be enabled with --enable-mpi independently from
  the examples. If MPI is enabled, the MPI examples are built if examples are
  activated and the MPI tests are checked if tests are activated. The MPI
  headers are installed in any case because MPI must be explicity requested by
  including hep/mc-mpi.hpp
• renamed hep::linear_grid to hep::vegas_pdf and moved code from VEGAS
  into this class
• add more unit tests, use Google Test as testing framework
• improved the MPI VEGAS example
• added new hep::mpi_single_generator function that adds the possibility to
  use the same random numbers for MPI and non-MPI routines. This makes
  hep::mpi_vegas return the same numerical result as hep::vegas
• fixed integer overflow bug on 32-bit architectures that caused VEGAS' grid
  adjustment to fail when the number of calls surpassed 2^16
• modified VEGAS callback functions to return a boolean variable signaling to
  stop all remaining iterations
• modified the verbose callback function to print the error in percentage

v0.2.2

• added two examples showing the advanced use of the VEGAS integration routine
• added a callback mechanism for the VEGAS routines; this enables one to print
  intermediate results from completed iterations
• added VEGAS routines that reuse existing grids
• grids can now be easily saved to files with iostream shift operators, see the
  example examples/read_linear_grid.cpp which can be used with the grid file
  in examples/grid_file

v0.2.1

• added MPI-parallelized PLAIN integration algorithm
• lowered dependency on autotools features

v0.2

• added new functions for combining several VEGAS results
• added MPI-based paralellized VEGAS integration algorithm
• improved documentation
• improved VEGAS performance

v0.1

• added PLAIN integrator
• added VEGAS integrator