RANTRI Function

Returns a random variate from a triangular distribution

Category: Random Number

Tip: If you want to change the seed value during execution, you must use the CALL RANTRI routine instead of the RANTRI function.

Syntax

RANTRI ( seed,h )

Arguments

seed

• is an integer. If seed ‰ 0, the time of day is used to initialize the seed stream.

• Range: seed < 2 ³¹ -1

• See: 'Seed Values' on page 257 for more information about seed values

h

• is a numeric SAS value.

• range: 0 < h < 1

Details

The RANTRI function returns a variate that is generated from the triangular distribution on the interval (0,1) with parameter h , which is the modal value of the distribution. An inverse transform method applied to a RANUNI uniform variate is used.

A triangular distribution X on the interval [A,B] with mode C, where A ‰ C ‰ B, can be generated:

 x=(b-a)*rantri(seed,(c-a)/(b-a))+a; 

Comparisons

The CALL RANTRI routine, an alternative to the RANTRI function, gives greater control of the seed and random number streams.

See Also

Call routine:

'CALL RANTRI Routine' on page 382