updated rand.h file

CFiles/rand.h

@@ -13,6 +13,7 @@
    double unirnd(void);
    double gaussrnd(void);
    double gammrnd(double a);
+   double betarnd(double a, double b);
    double cumulative_normal(double x);
 
 
@@ -32,8 +33,10 @@
    void SetSeedTableGFSR_IMSL(int iseed, int *itable);
    double UniformDouble(void);
    double StandardNormalDouble(void);
+   double NormalDouble(double m, double s);
    double LogNormalDouble(double mean, double std);
    double GammaDouble(const double a, const double b);
+   double InverseGammaDouble(const double a, const double b);
    double ChisquareDouble(const double v);
    void UniformVector(TSdvector *x_dv);
    void StandardNormalVector(TSdvector *x_dv);