LAPACK  3.6.1 LAPACK: Linear Algebra PACKage
 subroutine dlaord ( character JOB, integer N, double precision, dimension( * ) X, integer INCX )

DLAORD

Purpose:
``` DLAORD sorts the elements of a vector x in increasing or decreasing
order.```
Parameters
 [in] JOB ``` JOB is CHARACTER = 'I': Sort in increasing order = 'D': Sort in decreasing order``` [in] N ``` N is INTEGER The length of the vector X.``` [in,out] X ``` X is DOUBLE PRECISION array, dimension (1+(N-1)*INCX) On entry, the vector of length n to be sorted. On exit, the vector x is sorted in the prescribed order.``` [in] INCX ``` INCX is INTEGER The spacing between successive elements of X. INCX >= 0.```
Date
November 2011

Definition at line 75 of file dlaord.f.

75 *
76 * -- LAPACK test routine (version 3.4.0) --
77 * -- LAPACK is a software package provided by Univ. of Tennessee, --
78 * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
79 * November 2011
80 *
81 * .. Scalar Arguments ..
82  CHARACTER job
83  INTEGER incx, n
84 * ..
85 * .. Array Arguments ..
86  DOUBLE PRECISION x( * )
87 * ..
88 *
89 * =====================================================================
90 *
91 * .. Local Scalars ..
92  INTEGER i, inc, ix, ixnext
93  DOUBLE PRECISION temp
94 * ..
95 * .. External Functions ..
96  LOGICAL lsame
97  EXTERNAL lsame
98 * ..
99 * .. Intrinsic Functions ..
100  INTRINSIC abs
101 * ..
102 * .. Executable Statements ..
103 *
104  inc = abs( incx )
105  IF( lsame( job, 'I' ) ) THEN
106 *
107 * Sort in increasing order
108 *
109  DO 20 i = 2, n
110  ix = 1 + ( i-1 )*inc
111  10 CONTINUE
112  IF( ix.EQ.1 )
113  \$ GO TO 20
114  ixnext = ix - inc
115  IF( x( ix ).GT.x( ixnext ) ) THEN
116  GO TO 20
117  ELSE
118  temp = x( ix )
119  x( ix ) = x( ixnext )
120  x( ixnext ) = temp
121  END IF
122  ix = ixnext
123  GO TO 10
124  20 CONTINUE
125 *
126  ELSE IF( lsame( job, 'D' ) ) THEN
127 *
128 * Sort in decreasing order
129 *
130  DO 40 i = 2, n
131  ix = 1 + ( i-1 )*inc
132  30 CONTINUE
133  IF( ix.EQ.1 )
134  \$ GO TO 40
135  ixnext = ix - inc
136  IF( x( ix ).LT.x( ixnext ) ) THEN
137  GO TO 40
138  ELSE
139  temp = x( ix )
140  x( ix ) = x( ixnext )
141  x( ixnext ) = temp
142  END IF
143  ix = ixnext
144  GO TO 30
145  40 CONTINUE
146  END IF
147  RETURN
148 *
149 * End of DLAORD
150 *
logical function lsame(CA, CB)
LSAME
Definition: lsame.f:55

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