Developer Reference

Contents

?laran

Returns a random real number from a uniform distribution.

Syntax

float slaran
(
lapack_int
*iseed
);
double dlaran
(
lapack_int
*iseed
);
Description
The
?laran
routine returns a random real number from a uniform (0,1) distribution. This routine uses a multiplicative congruential method with modulus 2
48
and multiplier 33952834046453. 48-bit integers are stored in four integer array elements with 12 bits per element. Hence the routine is portable across machines with integers of 32 bits or more.
Input Parameters
iseed
Array, size 4. On entry, the seed of the random number generator. The array elements must be between 0 and 4095, and
iseed
[3]
must be odd.
Output Parameters
iseed
On exit, the seed is updated.
Return Values
The function returns a random number.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.