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Diffstat (limited to 'noao/astcat/src/awcs/varsvd.f')
| -rw-r--r-- | noao/astcat/src/awcs/varsvd.f | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/noao/astcat/src/awcs/varsvd.f b/noao/astcat/src/awcs/varsvd.f new file mode 100644 index 00000000..b779a1e0 --- /dev/null +++ b/noao/astcat/src/awcs/varsvd.f @@ -0,0 +1,24 @@ +C This routine was copied from stsdas$pkg/analysis/gasp/gasplib/. +C See stsdas$copyright.stsdas for copyright restrictions. +C + subroutine varsvd (v,ma,w,cvm,ncvm) + parameter (mmax=20) + real*8 v(ma,ma),w(ma),cvm(ncvm,ncvm),wti(mmax) + real*8 sum + + do i=1,ma + wti(i)=0. + if(w(i).ne.0.0d0) wti(i)=1./(w(i)*w(i)) + enddo + do i=1,ma + do j=1,i + sum=0. + do k=1,ma + sum=sum+v(i,k)*v(j,k)*wti(k) + enddo + cvm(i,j)=sum + cvm(j,i)=sum + enddo + enddo + return + end |