02-02-2013 06:23 PM
Hello Ladies and Gentlemen,
I am trying to output a random number within a proc iml statement.
For example if i do: A=RANUNI(-1); any time it give a different random number between 0 and 1.
Now I have my interval (Bi, Bi+1) and I want a random number between this interval. Just like RANUNI(-1), I want this interval to change anytime I run it and to vary as I vary my interval
02-02-2013 08:35 PM
See the article How to generate random numbers in SAS - The DO Loop which shows how to use the RANDGEN routine to generate random numbers. If u is in the inerval [0,1] then Bi+u is in the interval you want. You can use CALL RANDSEED(0) if you want the random number stream to be different each time you run the program. Remember also that if you are going to need thousands of random numbers to vectorize the program by allocating an array and filling it: Efficient Sampling - The DO Loop
03-05-2013 08:23 AM
If the uniform random number you generate equals RN, the random value within a specific interval from LOW to HIGH equals:
Random value = LOW + RN*(HIGH - LOW).