#
# = Using Ruby/GSL
# == {}[link:index.html"name="1] Installation
# See {here}[link:files/rdoc/index_rdoc.html].
#
# == {}[link:index.html"name="2] Load the library
# Put at the head of your scripts,
#     
#     require 'rubygems' # if installed via RubyGems
#     require 'gsl'
#
# == {}[link:index.html"name="3] Naming conventions, C Structs and Ruby Classes
#
# Most of the GSL data types, functions or constants are named as <tt>gsl_xxx</tt> or <tt>GSL_XXX</tt>. 
# In Ruby/GSL, the prefix <tt>gsl_</tt> is replaced by the module identifier <tt>GSL::</tt>, 
# where <tt>GSL</tt> is the top level module of Ruby/GSL,
# and the Ruby classes are defined for each of the GSL C structs under the <tt>GSL</tt> module.
# According to the Ruby manner, the name of each class begins with a capital. For example,
#
# * Struct <tt>gsl_vector</tt> ---> Ruby class <tt>GSL::Vector</tt>
#   * Function call as <tt>v = gsl_vector_alloc(5);</tt> ---> Class method <tt>v = GSL::Vector.alloc(5)</tt>
#   * Function call as <tt>gsl_vector_set(v, i, 1.5);</tt> ---> Method <tt>v.set(i, 1.5)</tt> or <tt>v[i] = 1.5</tt>
# * Constant <tt>GSL_SUCCESS</tt> ---> Ruby module constant <tt>GSL::SUCCESS</tt>
# * Function <tt>gsl_sf_bessel_J0(x)</tt> --->
#   * Submodule <tt>GSL::Sf</tt>
#   * Module function <tt>GSL::Sf::bessel_J0(x)</tt>
#     * <tt>GSL::Sf::Bessel::J0(x)</tt> is also OK, where <tt>J0(x)</tt> is a module function of the sub-sub-module <tt>GSL::Sf::Bessel</tt>.
# * Function <tt>gsl_linalg_LU_decomp</tt> --->
#   * Module <tt>GSL::Linalg::LU</tt>
#     * Singleton method <tt>GSL::Linalg::LU_decomp</tt>
#     * Submodule <tt>GSL::Linalg::LU</tt>
#       * Singleton method <tt>GSL::Linalg::LU.decomp</tt>
#   * Method <tt>GSL::Matrix#LU_decomp</tt>
#
# == {}[link:index.html"name="4] Examples
# See the directories "examples/" and "tests/".
#
# Some of the examples use the <tt>graph</tt> utility to show the results. The <tt>graph</tt>
# utility is included in the {GNU plotutils}[http://www.gnu.org/software/plotutils/plotutils.html"target="_top] package. Windows-cygwin binaries of <tt>GNU plotutils</tt> and 
# related packages are available from 
# {here}[http://rustam.uwp.edu/support"target="_top].
#
# == {}[link:index.html"name="5] Modules and Classes
# The following is the list of Ruby/GSL modules and classes, <Name> (<Module or Class>)
#
# * GSL (Module) 
#   * Complex (Class) 
#   * Poly (Class) 
#     * Workspace (Class)
#     * DividedDifferenceRepresentation (Class)
#     * Taylor (Class)
#   * Sf (Module) 
#     * Result (Class)
#   * Block (Class)
#     * Int (Class)
#     * Byte (Class)
#     * Index < Permutation
#   * Vector (Class) 
#     * View < Vector
#     * Complex (Class)
#       * View < Vector::Complex
#   * Matrix (Class) 
#     * View < Matrix (Class)
#     * Complex (Class)
#       * View < Matrix::Complex
#   * Permutation (Class) 
#   * Combination (Class) 
#   * Linalg (Module) 
#     * LU (Module)
#     * QR (Module)
#     * QRPT (Module)
#     * LQ (Module)
#     * LQPT (Module)
#     * SV (Module)
#     * Cholesky (Module)
#     * Symmtd (Module)
#     * HH (Module)
#   * Eigen (Module)
#     * EigenValues < Vector
#     * EigenVectors < Matrix
#     * Symm (Module)
#       * Workspace (Class)
#     * Symmv (Module)
#       * Workspace (Class)
#     * Unsymm (Module)
#       * Workspace (Class)
#     * Unsymmv (Module)
#       * Workspace (Class)
#     * Herm (Module)
#       * Workspace (Class)
#     * Hermv (Module)
#       * Workspace (Class)
#   * FFT (Module) 
#     * ComplexWavetable (Class)
#     * ComplexWorkspace (Class)
#     * HalfComplexWavetable (Class)
#     * RealWavetable (Class)
#     * RealWorkspace (Class)      
#   * Wavelet (Class)
#     * Wavelet2d < Wavelet
#   * Function (Class)
#   * Function_fdf (Class)
#   * Integration (Module)
#     * Workspace
#     * QAWS_Table
#     * QAWO_Table
#   * Rng (Class) 
#   * QRng (Class)
#   * Ran (Module)
#   * Stats (Module) 
#   * Histogram (Class) 
#     * Integral < Histogram
#     * Pdf (Class)
#   * Histogram2d (Class)
#   * N-tuples 
#     * SelectFn (Class)
#     * ValueFn (Class)
#   * Monte (Module)
#     * Function (Class)
#     * Plain (Class)
#     * Miser (Class)
#     * Vegas (Class)
#   * Siman (Module)
#     * Efunc (Class)
#     * Step (Class)
#     * Metric (Class)
#     * Print (Class)
#     * Params (Class)
#     * Solver (Class)
#   * Odeiv (Module)
#     * Control (Class)
#     * Evolve (Class)
#     * System (Class)
#     * Solver (Class)
#   * Interp (Class)
#     * Accel (Class)
#   * Spline (Class)
#   * Diff (Module) 
#   * Deriv (Module)
#   * Cheb (Class) 
#   * Sum (Module) 
#     * Levin_u (Class)
#     * Levin_utrunc (Class)
#   * Dht (Class) 
#   * Root (Module)
#     * Solver (Class)
#     * FdfSolver (Class)
#   * Min(Module) 
#     * FMinimizer (Class)
#   * MultiRoot (Module)
#     * Function (Class)
#     * FSolver (Class)
#     * Function_fdf (Class)
#     * FdfSolver (Class)
#   * MultiMin (Module) 
#     * Function (Class)
#     * FMinimizer (Class)
#     * Function_fdf (Class)
#     * FdfMinimizer (Class)
#   * Fit (Module) 
#   * MultiFit (Module)
#     * Workspace (Class)
#     * Solver (Class)
#     * Function_fdf (Class)
#     * FdfSolver (Class)
#   * CONST (Module) 
#     * MKSA (Module)
#     * CGSM (Module)
#     * NUM (Module)
#
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