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LAPACK 3.3.1
Linear Algebra PACKage
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LAPACK 3.3.1
Linear Algebra PACKage
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00001 SUBROUTINE CLATM1( MODE, COND, IRSIGN, IDIST, ISEED, D, N, INFO ) 00002 * 00003 * -- LAPACK auxiliary test routine (version 3.1) -- 00004 * Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. 00005 * June 2010 00006 * 00007 * .. Scalar Arguments .. 00008 INTEGER IDIST, INFO, IRSIGN, MODE, N 00009 REAL COND 00010 * .. 00011 * .. Array Arguments .. 00012 INTEGER ISEED( 4 ) 00013 COMPLEX D( * ) 00014 * .. 00015 * 00016 * Purpose 00017 * ======= 00018 * 00019 * CLATM1 computes the entries of D(1..N) as specified by 00020 * MODE, COND and IRSIGN. IDIST and ISEED determine the generation 00021 * of random numbers. CLATM1 is called by CLATMR to generate 00022 * random test matrices for LAPACK programs. 00023 * 00024 * Arguments 00025 * ========= 00026 * 00027 * MODE (input) INTEGER 00028 * On entry describes how D is to be computed: 00029 * MODE = 0 means do not change D. 00030 * MODE = 1 sets D(1)=1 and D(2:N)=1.0/COND 00031 * MODE = 2 sets D(1:N-1)=1 and D(N)=1.0/COND 00032 * MODE = 3 sets D(I)=COND**(-(I-1)/(N-1)) 00033 * MODE = 4 sets D(i)=1 - (i-1)/(N-1)*(1 - 1/COND) 00034 * MODE = 5 sets D to random numbers in the range 00035 * ( 1/COND , 1 ) such that their logarithms 00036 * are uniformly distributed. 00037 * MODE = 6 set D to random numbers from same distribution 00038 * as the rest of the matrix. 00039 * MODE < 0 has the same meaning as ABS(MODE), except that 00040 * the order of the elements of D is reversed. 00041 * Thus if MODE is positive, D has entries ranging from 00042 * 1 to 1/COND, if negative, from 1/COND to 1, 00043 * Not modified. 00044 * 00045 * COND (input) REAL 00046 * On entry, used as described under MODE above. 00047 * If used, it must be >= 1. Not modified. 00048 * 00049 * IRSIGN (input) INTEGER 00050 * On entry, if MODE neither -6, 0 nor 6, determines sign of 00051 * entries of D 00052 * 0 => leave entries of D unchanged 00053 * 1 => multiply each entry of D by random complex number 00054 * uniformly distributed with absolute value 1 00055 * 00056 * IDIST (input) CHARACTER*1 00057 * On entry, IDIST specifies the type of distribution to be 00058 * used to generate a random matrix . 00059 * 1 => real and imaginary parts each UNIFORM( 0, 1 ) 00060 * 2 => real and imaginary parts each UNIFORM( -1, 1 ) 00061 * 3 => real and imaginary parts each NORMAL( 0, 1 ) 00062 * 4 => complex number uniform in DISK( 0, 1 ) 00063 * Not modified. 00064 * 00065 * ISEED (input/output) INTEGER array, dimension ( 4 ) 00066 * On entry ISEED specifies the seed of the random number 00067 * generator. The random number generator uses a 00068 * linear congruential sequence limited to small 00069 * integers, and so should produce machine independent 00070 * random numbers. The values of ISEED are changed on 00071 * exit, and can be used in the next call to CLATM1 00072 * to continue the same random number sequence. 00073 * Changed on exit. 00074 * 00075 * D (input/output) COMPLEX array, dimension ( MIN( M , N ) ) 00076 * Array to be computed according to MODE, COND and IRSIGN. 00077 * May be changed on exit if MODE is nonzero. 00078 * 00079 * N (input) INTEGER 00080 * Number of entries of D. Not modified. 00081 * 00082 * INFO (output) INTEGER 00083 * 0 => normal termination 00084 * -1 => if MODE not in range -6 to 6 00085 * -2 => if MODE neither -6, 0 nor 6, and 00086 * IRSIGN neither 0 nor 1 00087 * -3 => if MODE neither -6, 0 nor 6 and COND less than 1 00088 * -4 => if MODE equals 6 or -6 and IDIST not in range 1 to 4 00089 * -7 => if N negative 00090 * 00091 * ===================================================================== 00092 * 00093 * .. Parameters .. 00094 REAL ONE 00095 PARAMETER ( ONE = 1.0E0 ) 00096 * .. 00097 * .. Local Scalars .. 00098 INTEGER I 00099 REAL ALPHA, TEMP 00100 COMPLEX CTEMP 00101 * .. 00102 * .. External Functions .. 00103 REAL SLARAN 00104 COMPLEX CLARND 00105 EXTERNAL SLARAN, CLARND 00106 * .. 00107 * .. External Subroutines .. 00108 EXTERNAL CLARNV, XERBLA 00109 * .. 00110 * .. Intrinsic Functions .. 00111 INTRINSIC ABS, EXP, LOG, REAL 00112 * .. 00113 * .. Executable Statements .. 00114 * 00115 * Decode and Test the input parameters. Initialize flags & seed. 00116 * 00117 INFO = 0 00118 * 00119 * Quick return if possible 00120 * 00121 IF( N.EQ.0 ) 00122 $ RETURN 00123 * 00124 * Set INFO if an error 00125 * 00126 IF( MODE.LT.-6 .OR. MODE.GT.6 ) THEN 00127 INFO = -1 00128 ELSE IF( ( MODE.NE.-6 .AND. MODE.NE.0 .AND. MODE.NE.6 ) .AND. 00129 $ ( IRSIGN.NE.0 .AND. IRSIGN.NE.1 ) ) THEN 00130 INFO = -2 00131 ELSE IF( ( MODE.NE.-6 .AND. MODE.NE.0 .AND. MODE.NE.6 ) .AND. 00132 $ COND.LT.ONE ) THEN 00133 INFO = -3 00134 ELSE IF( ( MODE.EQ.6 .OR. MODE.EQ.-6 ) .AND. 00135 $ ( IDIST.LT.1 .OR. IDIST.GT.4 ) ) THEN 00136 INFO = -4 00137 ELSE IF( N.LT.0 ) THEN 00138 INFO = -7 00139 END IF 00140 * 00141 IF( INFO.NE.0 ) THEN 00142 CALL XERBLA( 'CLATM1', -INFO ) 00143 RETURN 00144 END IF 00145 * 00146 * Compute D according to COND and MODE 00147 * 00148 IF( MODE.NE.0 ) THEN 00149 GO TO ( 10, 30, 50, 70, 90, 110 )ABS( MODE ) 00150 * 00151 * One large D value: 00152 * 00153 10 CONTINUE 00154 DO 20 I = 1, N 00155 D( I ) = ONE / COND 00156 20 CONTINUE 00157 D( 1 ) = ONE 00158 GO TO 120 00159 * 00160 * One small D value: 00161 * 00162 30 CONTINUE 00163 DO 40 I = 1, N 00164 D( I ) = ONE 00165 40 CONTINUE 00166 D( N ) = ONE / COND 00167 GO TO 120 00168 * 00169 * Exponentially distributed D values: 00170 * 00171 50 CONTINUE 00172 D( 1 ) = ONE 00173 IF( N.GT.1 ) THEN 00174 ALPHA = COND**( -ONE / REAL( N-1 ) ) 00175 DO 60 I = 2, N 00176 D( I ) = ALPHA**( I-1 ) 00177 60 CONTINUE 00178 END IF 00179 GO TO 120 00180 * 00181 * Arithmetically distributed D values: 00182 * 00183 70 CONTINUE 00184 D( 1 ) = ONE 00185 IF( N.GT.1 ) THEN 00186 TEMP = ONE / COND 00187 ALPHA = ( ONE-TEMP ) / REAL( N-1 ) 00188 DO 80 I = 2, N 00189 D( I ) = REAL( N-I )*ALPHA + TEMP 00190 80 CONTINUE 00191 END IF 00192 GO TO 120 00193 * 00194 * Randomly distributed D values on ( 1/COND , 1): 00195 * 00196 90 CONTINUE 00197 ALPHA = LOG( ONE / COND ) 00198 DO 100 I = 1, N 00199 D( I ) = EXP( ALPHA*SLARAN( ISEED ) ) 00200 100 CONTINUE 00201 GO TO 120 00202 * 00203 * Randomly distributed D values from IDIST 00204 * 00205 110 CONTINUE 00206 CALL CLARNV( IDIST, ISEED, N, D ) 00207 * 00208 120 CONTINUE 00209 * 00210 * If MODE neither -6 nor 0 nor 6, and IRSIGN = 1, assign 00211 * random signs to D 00212 * 00213 IF( ( MODE.NE.-6 .AND. MODE.NE.0 .AND. MODE.NE.6 ) .AND. 00214 $ IRSIGN.EQ.1 ) THEN 00215 DO 130 I = 1, N 00216 CTEMP = CLARND( 3, ISEED ) 00217 D( I ) = D( I )*( CTEMP / ABS( CTEMP ) ) 00218 130 CONTINUE 00219 END IF 00220 * 00221 * Reverse if MODE < 0 00222 * 00223 IF( MODE.LT.0 ) THEN 00224 DO 140 I = 1, N / 2 00225 CTEMP = D( I ) 00226 D( I ) = D( N+1-I ) 00227 D( N+1-I ) = CTEMP 00228 140 CONTINUE 00229 END IF 00230 * 00231 END IF 00232 * 00233 RETURN 00234 * 00235 * End of CLATM1 00236 * 00237 END
1.7.3 
