diff options
| author | Joseph Hunkeler <jhunkeler@gmail.com> | 2015-07-08 20:46:52 -0400 |
|---|---|---|
| committer | Joseph Hunkeler <jhunkeler@gmail.com> | 2015-07-08 20:46:52 -0400 |
| commit | fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 (patch) | |
| tree | bdda434976bc09c864f2e4fa6f16ba1952b1e555 /noao/astcat/src/awcs/fitsvd.f | |
| download | iraf-linux-fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4.tar.gz | |
Initial commit
Diffstat (limited to 'noao/astcat/src/awcs/fitsvd.f')
| -rw-r--r-- | noao/astcat/src/awcs/fitsvd.f | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/noao/astcat/src/awcs/fitsvd.f b/noao/astcat/src/awcs/fitsvd.f new file mode 100644 index 00000000..bb8d0f4e --- /dev/null +++ b/noao/astcat/src/awcs/fitsvd.f @@ -0,0 +1,38 @@ +C This routine was copied from the stsdas$pkg/analysis/gasp/gasplib/ +C directory. See stsdas$copyright.stsdas for copyright restrictions. +C + subroutine fitsvd (x, y, wg, npts, coef, nterms, + * u, v, w, chisq) + parameter(nmax=1000,mmax=50,tol=1.d-14) + + real wg(npts) + real*8 x(npts,nterms), y(npts), coef(nterms), v(nterms,nterms), + * u(npts,nterms), w(nterms), b(nmax) + real*8 wmax, thresh, chisq, sum + + do i=1,npts + do j=1,nterms + u(i,j)=x(i,j)*wg(i) + enddo + b(i)=y(i)*wg(i) + enddo + call dcmpsv (u,npts,nterms,w,v) + wmax=0. + do j=1,nterms + if(w(j).gt.wmax) wmax=w(j) + enddo + thresh=tol*wmax + do j=1,nterms + if(w(j).lt.thresh) w(j)=0. + enddo + call ksbsvd (u, w, v, npts, nterms, b, coef) + chisq=0. + do i=1,npts + sum=0. + do j=1,nterms + sum=sum+coef(j)*x(i,j) + enddo + chisq=chisq+((y(i)-sum)*wg(i))**2 + enddo + return + end |