slaruv.f
来自「famous linear algebra library (LAPACK) p」· F 代码 · 共 388 行 · 第 1/2 页
F
388 行
SUBROUTINE SLARUV( ISEED, N, X )
*
* -- LAPACK auxiliary routine (version 3.1) --
* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
* November 2006
*
* .. Scalar Arguments ..
INTEGER N
* ..
* .. Array Arguments ..
INTEGER ISEED( 4 )
REAL X( N )
* ..
*
* Purpose
* =======
*
* SLARUV returns a vector of n random real numbers from a uniform (0,1)
* distribution (n <= 128).
*
* This is an auxiliary routine called by SLARNV and CLARNV.
*
* Arguments
* =========
*
* ISEED (input/output) INTEGER array, dimension (4)
* On entry, the seed of the random number generator; the array
* elements must be between 0 and 4095, and ISEED(4) must be
* odd.
* On exit, the seed is updated.
*
* N (input) INTEGER
* The number of random numbers to be generated. N <= 128.
*
* X (output) REAL array, dimension (N)
* The generated random numbers.
*
* Further Details
* ===============
*
* This routine uses a multiplicative congruential method with modulus
* 2**48 and multiplier 33952834046453 (see G.S.Fishman,
* 'Multiplicative congruential random number generators with modulus
* 2**b: an exhaustive analysis for b = 32 and a partial analysis for
* b = 48', Math. Comp. 189, pp 331-344, 1990).
*
* 48-bit integers are stored in 4 integer array elements with 12 bits
* per element. Hence the routine is portable across machines with
* integers of 32 bits or more.
*
* =====================================================================
*
* .. Parameters ..
REAL ONE
PARAMETER ( ONE = 1.0E0 )
INTEGER LV, IPW2
REAL R
PARAMETER ( LV = 128, IPW2 = 4096, R = ONE / IPW2 )
* ..
* .. Local Scalars ..
INTEGER I, I1, I2, I3, I4, IT1, IT2, IT3, IT4, J
* ..
* .. Local Arrays ..
INTEGER MM( LV, 4 )
* ..
* .. Intrinsic Functions ..
INTRINSIC MIN, MOD, REAL
* ..
* .. Data statements ..
DATA ( MM( 1, J ), J = 1, 4 ) / 494, 322, 2508,
$ 2549 /
DATA ( MM( 2, J ), J = 1, 4 ) / 2637, 789, 3754,
$ 1145 /
DATA ( MM( 3, J ), J = 1, 4 ) / 255, 1440, 1766,
$ 2253 /
DATA ( MM( 4, J ), J = 1, 4 ) / 2008, 752, 3572,
$ 305 /
DATA ( MM( 5, J ), J = 1, 4 ) / 1253, 2859, 2893,
$ 3301 /
DATA ( MM( 6, J ), J = 1, 4 ) / 3344, 123, 307,
$ 1065 /
DATA ( MM( 7, J ), J = 1, 4 ) / 4084, 1848, 1297,
$ 3133 /
DATA ( MM( 8, J ), J = 1, 4 ) / 1739, 643, 3966,
$ 2913 /
DATA ( MM( 9, J ), J = 1, 4 ) / 3143, 2405, 758,
$ 3285 /
DATA ( MM( 10, J ), J = 1, 4 ) / 3468, 2638, 2598,
$ 1241 /
DATA ( MM( 11, J ), J = 1, 4 ) / 688, 2344, 3406,
$ 1197 /
DATA ( MM( 12, J ), J = 1, 4 ) / 1657, 46, 2922,
$ 3729 /
DATA ( MM( 13, J ), J = 1, 4 ) / 1238, 3814, 1038,
$ 2501 /
DATA ( MM( 14, J ), J = 1, 4 ) / 3166, 913, 2934,
$ 1673 /
DATA ( MM( 15, J ), J = 1, 4 ) / 1292, 3649, 2091,
$ 541 /
DATA ( MM( 16, J ), J = 1, 4 ) / 3422, 339, 2451,
$ 2753 /
DATA ( MM( 17, J ), J = 1, 4 ) / 1270, 3808, 1580,
$ 949 /
DATA ( MM( 18, J ), J = 1, 4 ) / 2016, 822, 1958,
$ 2361 /
DATA ( MM( 19, J ), J = 1, 4 ) / 154, 2832, 2055,
$ 1165 /
DATA ( MM( 20, J ), J = 1, 4 ) / 2862, 3078, 1507,
$ 4081 /
DATA ( MM( 21, J ), J = 1, 4 ) / 697, 3633, 1078,
$ 2725 /
DATA ( MM( 22, J ), J = 1, 4 ) / 1706, 2970, 3273,
$ 3305 /
DATA ( MM( 23, J ), J = 1, 4 ) / 491, 637, 17,
$ 3069 /
DATA ( MM( 24, J ), J = 1, 4 ) / 931, 2249, 854,
$ 3617 /
DATA ( MM( 25, J ), J = 1, 4 ) / 1444, 2081, 2916,
$ 3733 /
DATA ( MM( 26, J ), J = 1, 4 ) / 444, 4019, 3971,
$ 409 /
DATA ( MM( 27, J ), J = 1, 4 ) / 3577, 1478, 2889,
$ 2157 /
DATA ( MM( 28, J ), J = 1, 4 ) / 3944, 242, 3831,
$ 1361 /
DATA ( MM( 29, J ), J = 1, 4 ) / 2184, 481, 2621,
$ 3973 /
DATA ( MM( 30, J ), J = 1, 4 ) / 1661, 2075, 1541,
$ 1865 /
DATA ( MM( 31, J ), J = 1, 4 ) / 3482, 4058, 893,
$ 2525 /
DATA ( MM( 32, J ), J = 1, 4 ) / 657, 622, 736,
$ 1409 /
DATA ( MM( 33, J ), J = 1, 4 ) / 3023, 3376, 3992,
$ 3445 /
DATA ( MM( 34, J ), J = 1, 4 ) / 3618, 812, 787,
$ 3577 /
DATA ( MM( 35, J ), J = 1, 4 ) / 1267, 234, 2125,
$ 77 /
DATA ( MM( 36, J ), J = 1, 4 ) / 1828, 641, 2364,
$ 3761 /
DATA ( MM( 37, J ), J = 1, 4 ) / 164, 4005, 2460,
$ 2149 /
DATA ( MM( 38, J ), J = 1, 4 ) / 3798, 1122, 257,
$ 1449 /
DATA ( MM( 39, J ), J = 1, 4 ) / 3087, 3135, 1574,
$ 3005 /
DATA ( MM( 40, J ), J = 1, 4 ) / 2400, 2640, 3912,
$ 225 /
DATA ( MM( 41, J ), J = 1, 4 ) / 2870, 2302, 1216,
$ 85 /
DATA ( MM( 42, J ), J = 1, 4 ) / 3876, 40, 3248,
$ 3673 /
DATA ( MM( 43, J ), J = 1, 4 ) / 1905, 1832, 3401,
$ 3117 /
DATA ( MM( 44, J ), J = 1, 4 ) / 1593, 2247, 2124,
$ 3089 /
DATA ( MM( 45, J ), J = 1, 4 ) / 1797, 2034, 2762,
$ 1349 /
DATA ( MM( 46, J ), J = 1, 4 ) / 1234, 2637, 149,
$ 2057 /
DATA ( MM( 47, J ), J = 1, 4 ) / 3460, 1287, 2245,
$ 413 /
DATA ( MM( 48, J ), J = 1, 4 ) / 328, 1691, 166,
$ 65 /
DATA ( MM( 49, J ), J = 1, 4 ) / 2861, 496, 466,
$ 1845 /
DATA ( MM( 50, J ), J = 1, 4 ) / 1950, 1597, 4018,
$ 697 /
DATA ( MM( 51, J ), J = 1, 4 ) / 617, 2394, 1399,
$ 3085 /
DATA ( MM( 52, J ), J = 1, 4 ) / 2070, 2584, 190,
$ 3441 /
DATA ( MM( 53, J ), J = 1, 4 ) / 3331, 1843, 2879,
$ 1573 /
DATA ( MM( 54, J ), J = 1, 4 ) / 769, 336, 153,
$ 3689 /
DATA ( MM( 55, J ), J = 1, 4 ) / 1558, 1472, 2320,
$ 2941 /
DATA ( MM( 56, J ), J = 1, 4 ) / 2412, 2407, 18,
$ 929 /
DATA ( MM( 57, J ), J = 1, 4 ) / 2800, 433, 712,
$ 533 /
DATA ( MM( 58, J ), J = 1, 4 ) / 189, 2096, 2159,
$ 2841 /
DATA ( MM( 59, J ), J = 1, 4 ) / 287, 1761, 2318,
$ 4077 /
DATA ( MM( 60, J ), J = 1, 4 ) / 2045, 2810, 2091,
$ 721 /
DATA ( MM( 61, J ), J = 1, 4 ) / 1227, 566, 3443,
$ 2821 /
DATA ( MM( 62, J ), J = 1, 4 ) / 2838, 442, 1510,
$ 2249 /
DATA ( MM( 63, J ), J = 1, 4 ) / 209, 41, 449,
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