X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/b5b850dd0d8d198990bd5fed9872005347f771fb..c2c36bb9b8f9f004079e2eb3064ccd25191ada87:/src/surf/lagrange.c

diff --git a/src/surf/lagrange.c b/src/surf/lagrange.c
index cfabb336ee..34a0df7c7e 100644
--- a/src/surf/lagrange.c
+++ b/src/surf/lagrange.c
@@ -465,3 +465,93 @@ double diff_aux(lmm_variable_t var, double x)
   XBT_OUT;
   return result;
 }
+
+
+/**************** Vegas and Reno functions *************************/
+/*
+ * NOTE for Reno: all functions consider the network
+ * coeficient (alpha) equal to 1.
+ */
+
+/*
+ * For Vegas f: $\alpha_f d_f \log\left(x_f\right)$
+ */
+double func_vegas_f(lmm_variable_t var, double x){
+  return var->df * log(x);
+}
+
+/*
+ * For Vegas fp: $\frac{\alpha D_f}{x}$
+ */
+double func_vegas_fp(lmm_variable_t var, double x){
+  //avoid a disaster value - c'est du bricolage mais ca marche
+/*   if(x == 0) x = 10e-8; */
+  return var->df/x;
+}
+
+/*
+ * For Vegas fpi: $\frac{\alpha D_f}{x}$
+ */
+double func_vegas_fpi(lmm_variable_t var, double x){
+  //avoid a disaster value - c'est du bricolage mais ca marche
+/*   if(x == 0) x = 10e-8; */
+  return var->df/x;
+}
+
+/*
+ * For Vegas fpip: $-\frac{\alpha D_f}{x^2}$
+ */
+double func_vegas_fpip(lmm_variable_t var, double x){
+  //avoid a disaster value - c'est du bricolage mais ca marche
+/*   if(x == 0) x = 10e-8; */
+  return -( var->df/(x*x) ) ;
+}
+
+
+/*
+ * For Reno f: $\frac{\sqrt{\frac{3}{2}}}{D_f} \arctan\left(\sqrt{\frac{3}{2}}x_f D_f\right)$
+ */
+double func_reno_f(lmm_variable_t var, double x){
+  xbt_assert0(var->df>0.0,"Don't call me with stupid values!");
+  // \sqrt{3/2} = 0.8164965808
+  return (0.8164965808 / var->df) * atan( (0.8164965808 / var->df)*x );
+}
+
+/*
+ * For Reno fp: $\frac{3}{3 {D_f}^2 x^2 + 2}$
+ */
+double func_reno_fp(lmm_variable_t var, double x){
+  return 3 / (3*var->df*var->df*x*x + 2);
+}
+
+/*
+ * For Reno fpi: $\sqrt{\frac{1}{{D_f}^2 x} - \frac{2}{3{D_f}^2}}$
+ */
+double func_reno_fpi(lmm_variable_t var, double x){
+  double res_fpi; 
+
+  xbt_assert0(var->df>0.0,"Don't call me with stupid values!");
+  xbt_assert0(x>0.0,"Don't call me with stupid values!");
+
+  res_fpi = 1/(var->df*var->df*x) - 2/(3*var->df*var->df);
+  if(res_fpi<=0.0) return 0.0;
+  xbt_assert0(res_fpi>0.0,"Don't call me with stupid values!");
+  return sqrt(res_fpi);
+}
+
+/*
+ * For Reno fpip:  $-\frac{1}{2 {D_f}^2 x^2\sqrt{\frac{1}{{D_f}^2 x} - \frac{2}{3{D_f}^2}}}$
+ */
+double func_reno_fpip(lmm_variable_t var, double x){
+  double res_fpip; 
+  double critical_test;
+
+  xbt_assert0(var->df>0.0,"Don't call me with stupid values!");
+  xbt_assert0(x>0.0,"Don't call me with stupid values!");
+
+  res_fpip = 1/(var->df*var->df*x) - 2/(3*var->df*var->df);
+  xbt_assert0(res_fpip>0.0,"Don't call me with stupid values!");
+  critical_test = (2*var->df*var->df*x*x*sqrt(res_fpip));
+
+  return -(1.0/critical_test);
+}