@Frank. Thank you. That's a sound answer! On Jun 11, 2012 10:35 AM, "Frank Reininghaus" <[email protected]> wrote:
> Hi, > > 2012/6/11 Juan Pablo Amorocho D.: > > What should be (computationally) the value of the intercept in this case? > > Nan seems right to me, but the slope /should/ be inf. Any comments? > > why should the slope be inf? It could just as well be -inf, couldn't > it? In other words: the slope is undefined, in which case returning > NaN is the most sensible thing to do IMHO. > > In any case, you wouldn't be able to use the slope for anything useful > later on. Note that gsl_fit_linear() tries to fit data with a function > y=m*x+b, which makes no sense at all for data points on a vertical > line. > > Cheers, > Frank >
