| 1 | subroutine bilinearbig(nX,nY,x_arr,y_arr,f2d_arr,x_in,y_in,f,ind) |
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| 2 | |
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| 3 | ! Necessary for interpolation of continuum data |
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| 4 | ! optimized by A. Spiga 01/2013 |
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| 5 | |
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| 6 | implicit none |
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| 7 | |
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| 8 | integer nX,nY,i,j,ind,b |
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| 9 | |
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| 10 | real*8 x_in,y_in,x1,x2,y1,y2 |
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| 11 | real*8 f,f11,f12,f21,f22,fA,fB |
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| 12 | real*8 x_arr(nX) |
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| 13 | real*8 y_arr(nY) |
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| 14 | real*8 f2d_arr(nX,nY) |
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| 15 | real*8,save :: x,y |
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| 16 | |
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| 17 | integer strlen |
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| 18 | character*100 label |
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| 19 | label='subroutine bilinear' |
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| 20 | |
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| 21 | |
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| 22 | x=x_in |
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| 23 | y=y_in |
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| 24 | |
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| 25 | !! AS: important to optimize here because the array is quite large |
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| 26 | !! ... and actually calculations only need to be done once |
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| 27 | !! IF ind=-9999 we have not calculated yet |
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| 28 | if ( ind == -9999) then |
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| 29 | !1st check we're within the wavenumber range |
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| 30 | if ((x.lt.x_arr(2)).or.(x.gt.x_arr(nX-2))) then |
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| 31 | ind=-1 |
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| 32 | else |
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| 33 | i=1 |
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| 34 | x2=x_arr(i) |
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| 35 | do while ( x2 .le. x ) |
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| 36 | x1=x2 |
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| 37 | i=i+1 |
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| 38 | x2=x_arr(i) |
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| 39 | ind=i-1 |
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| 40 | end do |
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| 41 | endif |
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| 42 | endif |
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| 43 | |
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| 44 | !! Either we already saw we are out of wavenumber range |
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| 45 | !! ... and we just have to set f=0 and exit |
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| 46 | if ( ind == -1) then |
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| 47 | f=0.0D+0 |
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| 48 | return |
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| 49 | !! Or we already determined ind -- so we just proceed |
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| 50 | else |
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| 51 | x1=x_arr(ind) |
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| 52 | x2=x_arr(ind+1) |
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| 53 | endif |
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| 54 | |
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| 55 | ! ... and for y within the temperature range |
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| 56 | if ((y.lt.y_arr(1)).or.(y.gt.y_arr(nY))) then |
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| 57 | write(*,*) 'Warning from bilinearH2H2:' |
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| 58 | write(*,*) 'Outside continuum temperature range!' |
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| 59 | if(y.lt.y_arr(1))then |
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| 60 | y=y_arr(1)+0.01 |
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| 61 | endif |
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| 62 | if(y.gt.y_arr(nY))then |
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| 63 | y=y_arr(nY)-0.01 |
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| 64 | endif |
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| 65 | else |
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| 66 | j=1 |
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| 67 | y2=y_arr(j) |
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| 68 | do while ( y2 .le. y ) |
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| 69 | y1=y2 |
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| 70 | j=j+1 |
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| 71 | y2=y_arr(j) |
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| 72 | b=j-1 |
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| 73 | end do |
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| 74 | endif |
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| 75 | |
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| 76 | f11=f2d_arr(ind,b) |
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| 77 | f21=f2d_arr(ind+1,b) |
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| 78 | f12=f2d_arr(ind,b+1) |
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| 79 | f22=f2d_arr(ind+1,b+1) |
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| 80 | |
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| 81 | call bilinear(f,f11,f21,f12,f22,x,x1,x2,y,y1,y2) |
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| 82 | |
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| 83 | return |
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| 84 | end subroutine bilinearbig |
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