/*-------------------<-- Start of Description -->--------------------\

| Generate random variate from a tabled probability distribution;    |

| The function was writen by Duo Zhou;                               |

|--------------------<!-- End of Description -->---------------------|

|--------------------------------------------------------------------|

|--------------<!-- Start of Files or Arguments Needed -->-----------|

| Arguments Need:                                                    |

|      seed - seed; Required, default is the current system time;    |

|      var  - the variable to save the generated random variates;    |

|      p    - the proportion array;                                  |

|      n    - the dimension of the proportion array;                 |

|      lower- the lower bound;                                       |

|      array- a temporary array for internal use or output purpose;  |

|      init - this function is being used the 1st time in the current|

|             data step or not? default is 1: declare an array for   |

|             use; otherwise: do not declare the array, since it was |

|             alreay declared earlier;                               |

|      temp0- the seed value saver;                                  |

|      temp1- a variable for internal use only;                      |

|---------------<!-- End of Files or Arguments Needed -->------------|

|--------------------------------------------------------------------|

|----------------<!-- Start of Example and Usage -->-----------------|

| Example                                                            |

|   data one;                                                        |

|      array _p(3) (0.25, 0.5, 0.25);                                |

|      %_rantbl(seed=1, var=x, n=3, p=_p);                           |

|      put x _rantbl_(1) _rantbl_(2) _rantbl0_;                      |

|      do i=1 to 100000;                                             |

|         %_rantbl(seed=_rantbl0_, var=x, n=3, p=_p, init=0);        |

|         output;                                                    |

|      end;                                                          |

|   run;%print(one(obs=200));                                        |

| Usage: _rantbl(seed=%sysfunc(datetime(), 15.), var=REQUIRED,       |

|                 n=REQUIRED, p=, lower=, array=_rantbl_, init=1,    |

|                 temp0=_rantbl0_, temp1=_rantbl1_);                 |

\-------------------<!-- End of Example and Usage -->---------------*/

%macro _rantbl(seed=%sysfunc(datetime(), 15.), var=REQUIRED, p=,

               n=REQUIRED,lower=, array=_rantbl_, temp0=_rantbl0_,

               temp1=_rantbl1_, init=1);

/*--------------------------------------------\

| Copy Right: Duo Zhou;                       |

| Created: 3-22-2002 6:30pm;                  |

| Purpose: Generate random variates from a    |

|          tabled probability distribution;   |

\--------------------------------------------*/

%let _nchk_=%sysfunc(rxmatch(%sysfunc(rxparse(.|$a|$A|$w)),&n));

%if (%quote(&seed) eq) or &_nchk_ or (%quote(&var) eq) %then %do;

   %if (%quote(&seed) eq) %then %do;

      %put ==> Error: This is not a valid seed!;

      &var=.;

   %end;

   %if &_nchk_ %then %do;

      %put ==> Error: &n is not a valid array size!;

      &var=.;

   %end;

   %if (%quote(&var) eq) %then %do;

      %put ==> Error: I need a valid variable name!;

   %end;

   %goto finish;

%end;

%else %if (&n le 1) %then %do;

      %put ==> Error: array size must be an integer large than 1!;

      %if (%length(&var)) %then %do; &var=.; %end;

%end;

%else %do;

   %if (not %sysfunc(rxmatch(%sysfunc(rxparse(_|.|$a|$A|$w)),&seed))) %then %do;

      drop &temp0;

      retain &temp0 &seed;

      %let seed=&temp0;

   %end;

   %if &init %then %do;

      drop &temp1;

      array &array(%eval(&n-1)) _temporary_;

      %if (%length(&p)) %then %do;

         &array(1)=&p(1);

         do &temp1=2 to %eval(&n-1);

            &array(&temp1)=&p(&temp1)+&array(&temp1-1);

         end;

      %end;

      %else %do;

         do &temp1=1 to &n-1;

            &array(&temp1)=&temp1/&n;

         end;

      %end;

   %end;

   call ranuni(&seed, &var);

   do &temp1=1 to &n-1 until(&var>1);

      if &var<=&array(&temp1) then &var=&temp1;

   end;

   if &var<1 then &var=&n;

   %if (%length(&lower)) %then &var=&var+&lower-1;

%end;

%finish:

%mend _rantbl;

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