ccopy.f (2817B)
1 !> 2 ! @license Apache-2.0 3 ! 4 ! Copyright (c) 2020 The Stdlib Authors. 5 ! 6 ! Licensed under the Apache License, Version 2.0 (the "License"); 7 ! you may not use this file except in compliance with the License. 8 ! You may obtain a copy of the License at 9 ! 10 ! http://www.apache.org/licenses/LICENSE-2.0 11 ! 12 ! Unless required by applicable law or agreed to in writing, software 13 ! distributed under the License is distributed on an "AS IS" BASIS, 14 ! WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 ! See the License for the specific language governing permissions and 16 ! limitations under the License. 17 !< 18 19 !> Copies values from one complex single-precision floating-point vector to another complex single-precision floating-point vector. 20 ! 21 ! ## Notes 22 ! 23 ! * Modified version of reference BLAS level1 routine (version 3.9.0). Updated to "free form" Fortran 95. 24 ! 25 ! ## Authors 26 ! 27 ! * Univ. of Tennessee 28 ! * Univ. of California Berkeley 29 ! * Univ. of Colorado Denver 30 ! * NAG Ltd. 31 ! 32 ! ## History 33 ! 34 ! * Jack Dongarra, linpack, 3/11/78. 35 ! 36 ! - modified 12/3/93, array(1) declarations changed to array(*) 37 ! 38 ! ## License 39 ! 40 ! From <http://netlib.org/blas/faq.html>: 41 ! 42 ! > The reference BLAS is a freely-available software package. It is available from netlib via anonymous ftp and the World Wide Web. Thus, it can be included in commercial software packages (and has been). We only ask that proper credit be given to the authors. 43 ! > 44 ! > Like all software, it is copyrighted. It is not trademarked, but we do ask the following: 45 ! > 46 ! > * If you modify the source for these routines we ask that you change the name of the routine and comment the changes made to the original. 47 ! > 48 ! > * We will gladly answer any questions regarding the software. If a modification is done, however, it is the responsibility of the person who modified the routine to provide support. 49 ! 50 ! @param {integer} N - number of values to copy 51 ! @param {Array<complex>} cx - input array 52 ! @param {integer} strideX - `cx` stride length 53 ! @param {Array<complex>} cy - destination array 54 ! @param {integer} strideY - `cy` stride length 55 !< 56 subroutine ccopy( N, cx, strideX, cy, strideY ) 57 implicit none 58 ! .. 59 ! Scalar arguments: 60 integer :: strideX, strideY, N 61 ! .. 62 ! Array arguments: 63 complex :: cx(*), cy(*) 64 ! .. 65 ! Local scalars: 66 integer :: ix, iy, i 67 ! .. 68 if ( N <= 0 ) then 69 return 70 end if 71 ! .. 72 if ( strideX == 1 .AND. strideY == 1 ) then 73 do i = 1, N 74 cy( i ) = cx( i ) 75 end do 76 else 77 if ( strideX < 0 ) then 78 ix = ((1-N)*strideX) + 1 79 else 80 ix = 1 81 end if 82 if ( strideY < 0 ) then 83 iy = ((1-N)*strideY) + 1 84 else 85 iy = 1 86 end if 87 do i = 1, N 88 cy( iy ) = cx( ix ) 89 ix = ix + strideX 90 iy = iy + strideY 91 end do 92 end if 93 return 94 end subroutine ccopy