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annotate liboctave/external/blas-xtra/dconv2.f @ 27919:1891570abac8
update Octave Project Developers copyright for the new year
In files that have the "Octave Project Developers" copyright notice,
update for 2020.
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 06 Jan 2020 22:29:51 -0500 |
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27919
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update Octave Project Developers copyright for the new year
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1 c Copyright (C) 2010-2020 The Octave Project Developers |
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2 c |
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3 c See the file COPYRIGHT.md in the top-level directory of this distribution |
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4 c or <https://octave.org/COPYRIGHT.html/>. |
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5 c |
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6 c |
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7 c Author: Jaroslav Hajek <highegg@gmail.com> |
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8 c |
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9 c This file is part of Octave. |
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10 c |
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11 c Octave is free software: you can redistribute it and/or modify it |
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12 c under the terms of the GNU General Public License as published by |
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13 c the Free Software Foundation, either version 3 of the License, or |
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14 c (at your option) any later version. |
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15 c |
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16 c Octave is distributed in the hope that it will be useful, but |
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17 c WITHOUT ANY WARRANTY; without even the implied warranty of |
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18 c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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19 c GNU General Public License for more details. |
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20 c |
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21 c You should have received a copy of the GNU General Public License |
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22 c along with Octave; see the file COPYING. If not, see |
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23 c <https://www.gnu.org/licenses/>. |
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24 c |
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25 subroutine dconv2o(ma,na,a,mb,nb,b,c) |
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26 c purpose: a 2-dimensional outer additive convolution. |
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27 c equivalent to the following: |
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28 c for i = 1:ma |
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29 c for j = 1:na |
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30 c c(i:i+mb-1,j:j+mb-1) += a(i,j)*b |
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31 c endfor |
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32 c endfor |
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33 c arguments: |
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34 c ma,na (in) dimensions of a |
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35 c a (in) 1st matrix |
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36 c mb,nb (in) dimensions of b |
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37 c b (in) 2nd matrix |
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38 c c (inout) accumulator matrix, size (ma+mb-1, na+nb-1) |
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39 c |
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40 integer ma,na,mb,nb |
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41 double precision a(ma,na),b(mb,nb) |
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42 double precision c(ma+mb-1,na+nb-1) |
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43 integer i,j,k |
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44 external daxpy |
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45 do k = 1,na |
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46 do j = 1,nb |
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47 do i = 1,mb |
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48 call daxpy(ma,b(i,j),a(1,k),1,c(i,j+k-1),1) |
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49 end do |
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50 end do |
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51 end do |
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52 end subroutine |
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53 |
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54 subroutine dconv2i(ma,na,a,mb,nb,b,c) |
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55 c purpose: a 2-dimensional inner additive convolution. |
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56 c equivalent to the following: |
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57 c for i = 1:ma-mb+1 |
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58 c for j = 1:na-nb+1 |
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59 c c(i,j) = sum (sum (a(i+mb-1:-1:i,j+nb-1:-1:j) .* b)) |
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60 c endfor |
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61 c endfor |
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62 c arguments: |
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63 c ma,na (in) dimensions of a |
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64 c a (in) 1st matrix |
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65 c mb,nb (in) dimensions of b |
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66 c b (in) 2nd matrix |
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67 c c (inout) accumulator matrix, size (ma+mb-1, na+nb-1) |
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68 c |
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69 integer ma,na,mb,nb |
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70 double precision a(ma,na),b(mb,nb) |
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71 double precision c(ma-mb+1,na-nb+1) |
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72 integer i,j,k |
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73 external daxpy |
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74 do k = 1,na-nb+1 |
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75 do j = 1,nb |
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76 do i = 1,mb |
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77 call daxpy(ma-mb+1,b(i,j),a(mb+1-i,k+nb-j),1,c(1,k),1) |
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78 end do |
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79 end do |
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80 end do |
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81 end subroutine |