On Friday, December 28, 2012 7:08:55 AM UTC-6, Francesco Paraggio wrote: > I need to interpolate a linear trend surface through a number of points but with the condition that the surface has to pass exactly through one of them. > > Can somebody give me any advice?
Google "Equality constrained least squares" for algorithms. Lapack has a driver xGGLSE for the problem. See www.netlib.org/lapack.