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Posted 11-22-2016 10:41 AM
(664 views)

Although the RANDGEN function should work on a vector of parameters, it doesn't give me the intended results. Even after generating a full matrix of parameter p in the code below by repeating the row vector (effectively a N*M matrix), the results clearly suggest that p is being taken as a scalar i.e. only the first element of p=0.1 from the matrix is used for whole matrix. I want to generate random numbers from a different distribution in each column.

%let N = 100;

%let M= 3;

proc iml;

call randseed(123);

x = j(&N,&M);

y = j(&N,&M);

p= j(1, &M);/*specify row vector*/

p= {.1 .2 .5}; /*Probability*/

p_mat = repeat(p, &N); /*Repeat probability parameter for j(&N,&M) matrix*/

call randgen(x, "Binomial",p_mat,&N );

x=x/&N;

mean=mean(x);

max=max(x);

print p,mean,max;

Quit;

RESULT:

p

0.1 | 0.2 | 0.5 |

mean

0.1014 | 0.1001 | 0.1075 |

max

0.2 |

1 ACCEPTED SOLUTION

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Read the documenation for the RANDGEN subroutine, which states:

*All parameters must be the same length. You cannot specify a scalar for one parameter and a vector for another. If you pass in parameter vectors that do not satisfy one of the above conditions, then the first element of each parameter is used. *

```
proc iml;
call randseed(123);
x = j(&N,&M);
p = {.1 .2 .5}; /*Probability*/
N = repeat(&N, 1, &M);
call randgen(x, "Binomial", p, N);
x=x/&N;
mean=mean(x);
print p, mean;
```

2 REPLIES 2

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Read the documenation for the RANDGEN subroutine, which states:

*All parameters must be the same length. You cannot specify a scalar for one parameter and a vector for another. If you pass in parameter vectors that do not satisfy one of the above conditions, then the first element of each parameter is used. *

```
proc iml;
call randseed(123);
x = j(&N,&M);
p = {.1 .2 .5}; /*Probability*/
N = repeat(&N, 1, &M);
call randgen(x, "Binomial", p, N);
x=x/&N;
mean=mean(x);
print p, mean;
```

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Thanks a million. It worked.

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