Displaying 1 result from an estimated 1 matches for "gas_per_g".
2007 Mar 03
2
Sigmoidal fitting
I am trying to write a function that fits a sigmoid given a X and Y vector guessing the start parameters.
I use nls. What I did (enclosed) seems to work well with many data points but if I want to fit small
vectors like :
pressure <- c(5,15,9,35,45)
gas <- c(1000,2000,3000,4000,5000)
it do not work. The help page says that it do no not work on zero residual data.
Massimo Cressoni