Developer Reference

  • 0.9
  • 09/09/2020
  • Public Content
Contents

?larnd

Returns a random real number from a uniform or normal distribution.

Syntax

float slarnd
(
lapack_int
*idist
,
lapack_int
*iseed
);
double dlarnd
(
lapack_int
*idist
,
lapack_int
*iseed
);
The data types for complex variations depend on whether or not the application links with Gnu Fortran (gfortran) libraries.
For non-gfortran (
libmkl_intel_*
) interface libraries:
void clarnd
(
lapack_complex_float
*res
,
lapack_int
*idist
,
lapack_int
*iseed
);
void zlarnd
(
lapack_complex_double
*res
,
lapack_int
*idist
,
lapack_int
*iseed
);
For gfortran (
libmkl_gf_*
) interface libraries:
lapack_complex_float clarnd
(
lapack_int
*idist
,
lapack_int
*iseed
);
lapack_complex_double zlarnd
(
lapack_int
*idist
,
lapack_int
*iseed
);
To understand the difference between the non-gfortran and gfortran interfaces and when to use each of them, see Dynamic Libraries in the lib/intel64 Directory in the
oneAPI Math Kernel Library Developer Guide
.
Include Files
  • mkl.h
Description
The routine
?larnd
returns a random number from a uniform or normal distribution.
Input Parameters
idist
Specifies the distribution of the random numbers. For
slarnd
and
dlanrd
:
= 1: uniform (0,1)
= 2: uniform (-1,1)
= 3: normal (0,1).
For
clarnd
and
zlanrd
:
= 1: real and imaginary parts each uniform (0,1)
= 2: real and imaginary parts each uniform (-1,1)
= 3: real and imaginary parts each normal (0,1)
= 4: uniformly distributed on the disc abs(z) ≤ 1
= 5: uniformly distributed on the circle abs(z) = 1
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
(for complex variations
libmkl_gf_*
interface layer/libraries return the result as the parameter
res
)
.

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804