Changes in lemon/random.h [280:e7f8647ce760:440:88ed40ad0d4f] in lemon-1.2

File:

• lemon/random.h (modified) (11 diffs)

lemon/random.h

@@ -3 +3 @@
  * This file is a part of LEMON, a generic C++ optimization library.
  *
- * Copyright (C) 2003-2008
+ * Copyright (C) 2003-2009
  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
  * (Egervary Research Group on Combinatorial Optimization, EGRES).
@@ -541 +541 @@
     /// @{
 
-    ///\name Initialization
-    ///
-    /// @{
-
     /// \brief Default constructor
     ///
@@ -693 +689 @@
     }
 
-    /// \brief Returns a random real number the range [0, b)
-    ///
-    /// It returns a random real number from the range [0, b).
-    template <typename Number>
-    Number real(Number b) {
-      return real<Number>() * b;
-    }
-
-    /// \brief Returns a random real number from the range [a, b)
-    ///
-    /// It returns a random real number from the range [a, b).
-    template <typename Number>
-    Number real(Number a, Number b) {
-      return real<Number>() * (b - a) + a;
-    }
-
-    /// @}
-
-    ///\name Uniform distributions
-    ///
-    /// @{
-
     /// \brief Returns a random real number from the range [0, 1)
     ///
@@ -725 +699 @@
     ///
     /// It returns a random real number from the range [0, b).
-    template <typename Number>
-    Number operator()(Number b) {
-      return real<Number>() * b;
+    double operator()(double b) {
+      return real<double>() * b;
     }
 
@@ -733 +706 @@
     ///
     /// It returns a random real number from the range [a, b).
-    template <typename Number>
-    Number operator()(Number a, Number b) {
-      return real<Number>() * (b - a) + a;
+    double operator()(double a, double b) {
+      return real<double>() * (b - a) + a;
     }
 
@@ -771 +743 @@
       return _random_bits::IntConversion<Number, Word>::convert(core);
     }
-
-    /// @}
 
     unsigned int uinteger() {
@@ -807 +777 @@
     ///\name Non-uniform distributions
     ///
-
     ///@{
 
-    /// \brief Returns a random bool
+    /// \brief Returns a random bool with given probability of true result.
     ///
     /// It returns a random bool with given probability of true result.
@@ -817 +786 @@
     }
 
-    /// Standard Gauss distribution
-
-    /// Standard Gauss distribution.
+    /// Standard normal (Gauss) distribution
+
+    /// Standard normal (Gauss) distribution.
     /// \note The Cartesian form of the Box-Muller
     /// transformation is used to generate a random normal distribution.
@@ -832 +801 @@
       return std::sqrt(-2*std::log(S)/S)*V1;
     }
-    /// Gauss distribution with given mean and standard deviation
-
-    /// Gauss distribution with given mean and standard deviation.
+    /// Normal (Gauss) distribution with given mean and standard deviation
+
+    /// Normal (Gauss) distribution with given mean and standard deviation.
     /// \sa gauss()
     double gauss(double mean,double std_dev)
     {
       return gauss()*std_dev+mean;
+    }
+
+    /// Lognormal distribution
+
+    /// Lognormal distribution. The parameters are the mean and the standard
+    /// deviation of <tt>exp(X)</tt>.
+    ///
+    double lognormal(double n_mean,double n_std_dev)
+    {
+      return std::exp(gauss(n_mean,n_std_dev));
+    }
+    /// Lognormal distribution
+
+    /// Lognormal distribution. The parameter is an <tt>std::pair</tt> of
+    /// the mean and the standard deviation of <tt>exp(X)</tt>.
+    ///
+    double lognormal(const std::pair<double,double> &params)
+    {
+      return std::exp(gauss(params.first,params.second));
+    }
+    /// Compute the lognormal parameters from mean and standard deviation
+
+    /// This function computes the lognormal parameters from mean and
+    /// standard deviation. The return value can direcly be passed to
+    /// lognormal().
+    std::pair<double,double> lognormalParamsFromMD(double mean,
+                                                   double std_dev)
+    {
+      double fr=std_dev/mean;
+      fr*=fr;
+      double lg=std::log(1+fr);
+      return std::pair<double,double>(std::log(mean)-lg/2.0,std::sqrt(lg));
+    }
+    /// Lognormal distribution with given mean and standard deviation
+
+    /// Lognormal distribution with given mean and standard deviation.
+    ///
+    double lognormalMD(double mean,double std_dev)
+    {
+      return lognormal(lognormalParamsFromMD(mean,std_dev));
     }
 
@@ -944 +953 @@
     ///\name Two dimensional distributions
     ///
-
     ///@{
 
@@ -961 +969 @@
       return dim2::Point<double>(V1,V2);
     }
-    /// A kind of two dimensional Gauss distribution
+    /// A kind of two dimensional normal (Gauss) distribution
 
     /// This function provides a turning symmetric two-dimensional distribution.