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annotate libcruft/lapack/dzsum1.f @ 5301:9302581b820d ss-2-9-2

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[project @ 2005-04-22 17:08:07 by jwe]
author jwe
date Fri, 22 Apr 2005 17:09:11 +0000
parents 15cddaacbc2d
children 68db500cb558
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1 DOUBLE PRECISION FUNCTION DZSUM1( N, CX, INCX )
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2 *
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3 * -- LAPACK auxiliary routine (version 3.0) --
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4 * Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,
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5 * Courant Institute, Argonne National Lab, and Rice University
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6 * October 31, 1992
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7 *
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8 * .. Scalar Arguments ..
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9 INTEGER INCX, N
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10 * ..
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11 * .. Array Arguments ..
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12 COMPLEX*16 CX( * )
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13 * ..
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14 *
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15 * Purpose
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16 * =======
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17 *
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18 * DZSUM1 takes the sum of the absolute values of a complex
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19 * vector and returns a double precision result.
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20 *
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21 * Based on DZASUM from the Level 1 BLAS.
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22 * The change is to use the 'genuine' absolute value.
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23 *
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24 * Contributed by Nick Higham for use with ZLACON.
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25 *
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26 * Arguments
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27 * =========
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28 *
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29 * N (input) INTEGER
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30 * The number of elements in the vector CX.
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31 *
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32 * CX (input) COMPLEX*16 array, dimension (N)
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33 * The vector whose elements will be summed.
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34 *
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35 * INCX (input) INTEGER
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36 * The spacing between successive values of CX. INCX > 0.
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37 *
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38 * =====================================================================
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39 *
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40 * .. Local Scalars ..
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41 INTEGER I, NINCX
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42 DOUBLE PRECISION STEMP
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43 * ..
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44 * .. Intrinsic Functions ..
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45 INTRINSIC ABS
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46 * ..
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47 * .. Executable Statements ..
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48 *
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49 DZSUM1 = 0.0D0
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50 STEMP = 0.0D0
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51 IF( N.LE.0 )
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52 $ RETURN
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53 IF( INCX.EQ.1 )
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54 $ GO TO 20
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55 *
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56 * CODE FOR INCREMENT NOT EQUAL TO 1
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57 *
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58 NINCX = N*INCX
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59 DO 10 I = 1, NINCX, INCX
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60 *
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61 * NEXT LINE MODIFIED.
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62 *
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63 STEMP = STEMP + ABS( CX( I ) )
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64 10 CONTINUE
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65 DZSUM1 = STEMP
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66 RETURN
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67 *
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68 * CODE FOR INCREMENT EQUAL TO 1
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69 *
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70 20 CONTINUE
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71 DO 30 I = 1, N
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72 *
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73 * NEXT LINE MODIFIED.
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74 *
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75 STEMP = STEMP + ABS( CX( I ) )
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76 30 CONTINUE
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77 DZSUM1 = STEMP
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78 RETURN
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79 *
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80 * End of DZSUM1
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81 *
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82 END