.TH "TESTING/MATGEN/dlatm7.f" 3 "Version 3.12.0" "LAPACK" \" -*- nroff -*-
.ad l
.nh
.SH NAME
TESTING/MATGEN/dlatm7.f
.SH SYNOPSIS
.br
.PP
.SS "Functions/Subroutines"

.in +1c
.ti -1c
.RI "subroutine \fBdlatm7\fP (mode, cond, irsign, idist, iseed, d, n, rank, info)"
.br
.RI "\fBDLATM7\fP "
.in -1c
.SH "Function/Subroutine Documentation"
.PP 
.SS "subroutine dlatm7 (integer mode, double precision cond, integer irsign, integer idist, integer, dimension( 4 ) iseed, double precision, dimension( * ) d, integer n, integer rank, integer info)"

.PP
\fBDLATM7\fP 
.PP
\fBPurpose:\fP
.RS 4

.PP
.nf
    DLATM7 computes the entries of D as specified by MODE
    COND and IRSIGN\&. IDIST and ISEED determine the generation
    of random numbers\&. DLATM7 is called by DLATMT to generate
    random test matrices\&.
.fi
.PP
 
.PP
.nf
  MODE   - INTEGER
           On entry describes how D is to be computed:
           MODE = 0 means do not change D\&.

           MODE = 1 sets D(1)=1 and D(2:RANK)=1\&.0/COND
           MODE = 2 sets D(1:RANK-1)=1 and D(RANK)=1\&.0/COND
           MODE = 3 sets D(I)=COND**(-(I-1)/(RANK-1)) I=1:RANK

           MODE = 4 sets D(i)=1 - (i-1)/(N-1)*(1 - 1/COND)
           MODE = 5 sets D to random numbers in the range
                    ( 1/COND , 1 ) such that their logarithms
                    are uniformly distributed\&.
           MODE = 6 set D to random numbers from same distribution
                    as the rest of the matrix\&.
           MODE < 0 has the same meaning as ABS(MODE), except that
              the order of the elements of D is reversed\&.
           Thus if MODE is positive, D has entries ranging from
              1 to 1/COND, if negative, from 1/COND to 1,
           Not modified\&.

  COND   - DOUBLE PRECISION
           On entry, used as described under MODE above\&.
           If used, it must be >= 1\&. Not modified\&.

  IRSIGN - INTEGER
           On entry, if MODE neither -6, 0 nor 6, determines sign of
           entries of D
           0 => leave entries of D unchanged
           1 => multiply each entry of D by 1 or -1 with probability \&.5

  IDIST  - CHARACTER*1
           On entry, IDIST specifies the type of distribution to be
           used to generate a random matrix \&.
           1 => UNIFORM( 0, 1 )
           2 => UNIFORM( -1, 1 )
           3 => NORMAL( 0, 1 )
           Not modified\&.

  ISEED  - INTEGER array, dimension ( 4 )
           On entry ISEED specifies the seed of the random number
           generator\&. The random number generator uses a
           linear congruential sequence limited to small
           integers, and so should produce machine independent
           random numbers\&. The values of ISEED are changed on
           exit, and can be used in the next call to DLATM7
           to continue the same random number sequence\&.
           Changed on exit\&.

  D      - DOUBLE PRECISION array, dimension ( MIN( M , N ) )
           Array to be computed according to MODE, COND and IRSIGN\&.
           May be changed on exit if MODE is nonzero\&.

  N      - INTEGER
           Number of entries of D\&. Not modified\&.

  RANK   - INTEGER
           The rank of matrix to be generated for modes 1,2,3 only\&.
           D( RANK+1:N ) = 0\&.
           Not modified\&.

  INFO   - INTEGER
            0  => normal termination
           -1  => if MODE not in range -6 to 6
           -2  => if MODE neither -6, 0 nor 6, and
                  IRSIGN neither 0 nor 1
           -3  => if MODE neither -6, 0 nor 6 and COND less than 1
           -4  => if MODE equals 6 or -6 and IDIST not in range 1 to 3
           -7  => if N negative
.fi
.PP
 
.RE
.PP
\fBAuthor\fP
.RS 4
Univ\&. of Tennessee 
.PP
Univ\&. of California Berkeley 
.PP
Univ\&. of Colorado Denver 
.PP
NAG Ltd\&. 
.RE
.PP

.PP
Definition at line \fB120\fP of file \fBdlatm7\&.f\fP\&.
.SH "Author"
.PP 
Generated automatically by Doxygen for LAPACK from the source code\&.