Displaying 3 results from an estimated 3 matches for "hillslop".
Did you mean:
hillslope
2002 Nov 19
5
help reading a variably formatted text file
Dear R-Help,
I have a generated file that looks like the following:
----- Begin file -----
#
# Output File
#
float Version 2002.700000000000
int Numdays 31
int NumOFEs 1
#
# Hillslope-specific variables
#
char HillVarNames[ 3 ]
{Days In Simulation}
{Hillslope: Precipitation (mm)}
{Hillslope: Average detachment (kg/m**2)}
#
# OFE-specific variables
#
char OFEVarNames[ 3 ]
{Irrigation...
2011 Sep 13
0
nls, the four parameter logisitc equation, and prediction band
I have uploaded a datafile that contains the following two variables: time
(X value) and response (Y value). This is a fairly extensive file (with >
16000 entries). I have two questions:
1. I want to use the following equation to regress Y on X: Y-hat = min +
(max-min)/(1 + (X/EC50)^Hillslope).
Here is my R command:
nlsout <- nls(Y ~ (0 - (100-0)/(1 + (X/EC50)^hill)), start=c(EC50=125,
hill=-1))
However, I get the following error message:
Error in numericDeriv(form[[3L]], names(ind), env) :
Missing value or an infinity produced when evaluating the model
Could someone explain t...
2011 Sep 13
0
nls, the four parameter logistic equation, and prediction band
...a datafile that contains the following two variables: time
> (X value) and response (Y value). This is a fairly extensive file (with >
> 16000 entries). I have two questions:
>
> 1. I want to use the following equation to regress Y on X: Y-hat = min +
> (max-min)/(1 + (X/EC50)^Hillslope).
>
> Here is my R command:
>
> nlsout <- nls(Y ~ (0 - (100-0)/(1 + (X/EC50)^hill)), start=c(EC50=125,
> hill=-1))
>
> However, I get the following error message:
>
> Error in numericDeriv(form[[3L]], names(ind), env) :
> Missing value or an infinity produced...