Timur A. Fatkhullin
5279d1c41a
start developing of FITPACK C++ bindings mount_server.cpp: fix compilation error with GCC15
67 lines
2.3 KiB
Fortran
67 lines
2.3 KiB
Fortran
recursive subroutine bispeu(tx,nx,ty,ny,c,kx,ky,x,y,z,m,wrk,
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* lwrk, ier)
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implicit none
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c subroutine bispeu evaluates on a set of points (x(i),y(i)),i=1,...,m
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c a bivariate spline s(x,y) of degrees kx and ky, given in the
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c b-spline representation.
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c
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c calling sequence:
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c call bispeu(tx,nx,ty,ny,c,kx,ky,x,y,z,m,wrk,lwrk,
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c * iwrk,kwrk,ier)
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c
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c input parameters:
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c tx : real array, length nx, which contains the position of the
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c knots in the x-direction.
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c nx : integer, giving the total number of knots in the x-direction
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c ty : real array, length ny, which contains the position of the
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c knots in the y-direction.
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c ny : integer, giving the total number of knots in the y-direction
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c c : real array, length (nx-kx-1)*(ny-ky-1), which contains the
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c b-spline coefficients.
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c kx,ky : integer values, giving the degrees of the spline.
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c x : real array of dimension (mx).
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c y : real array of dimension (my).
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c m : on entry m must specify the number points. m >= 1.
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c wrk : real array of dimension lwrk. used as workspace.
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c lwrk : integer, specifying the dimension of wrk.
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c lwrk >= kx+ky+2
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c
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c output parameters:
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c z : real array of dimension m.
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c on successful exit z(i) contains the value of s(x,y)
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c at the point (x(i),y(i)), i=1,...,m.
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c ier : integer error flag
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c ier=0 : normal return
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c ier=10: invalid input data (see restrictions)
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c
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c restrictions:
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c m >=1, lwrk>=mx*(kx+1)+my*(ky+1), kwrk>=mx+my
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c tx(kx+1) <= x(i-1) <= x(i) <= tx(nx-kx), i=2,...,mx
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c ty(ky+1) <= y(j-1) <= y(j) <= ty(ny-ky), j=2,...,my
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c
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c other subroutines required:
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c fpbisp,fpbspl
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c
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c ..scalar arguments..
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integer nx,ny,kx,ky,m,lwrk,ier
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c ..array arguments..
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real*8 tx(nx),ty(ny),c((nx-kx-1)*(ny-ky-1)),x(m),y(m),z(m),
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* wrk(lwrk)
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c ..local scalars..
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integer iwrk(2)
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integer i, lwest
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c ..
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c before starting computations a data check is made. if the input data
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c are invalid control is immediately repassed to the calling program.
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ier = 10
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lwest = kx+ky+2
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if (lwrk.lt.lwest) go to 100
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if (m.lt.1) go to 100
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ier = 0
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do 10 i=1,m
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call fpbisp(tx,nx,ty,ny,c,kx,ky,x(i),1,y(i),1,z(i),wrk(1),
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* wrk(kx+2),iwrk(1),iwrk(2))
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10 continue
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100 return
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end
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