Matthew D. Furia MattNapsAlot
MattNapsAlot
/ install_version.R
Created
October 6, 2012 16:44
bug-fixed version of Hadley Wickham's install_version() method from the devtools package
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| library(devtools) | |
| install_version <- function (package, version = NULL, repos = getOption("repos"), | |
| type = getOption("pkgType"), ...) | |
| { | |
| contriburl <- contrib.url(repos, type) | |
| available <- available.packages(contriburl) | |
| ## converting the version to numeric breaks packages that use dashes in their version numbers | |
| # if (!is.null(version)) { |
MattNapsAlot
/ lma.logfit.R
Created
September 18, 2012 03:55
Fitting a 4-parameter logistic curve using the Levenburg-Marquardt algorithm
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| require('minpack.lm'); | |
| ###### START FUNCTION DEFINITIONS ########### | |
| ##Coded by M. Furia June 2007 | |
| lma.dologfit = function(x,y){ | |
| compute.logistic.x = function(y,min,max,infl,slope){ | |
| return(infl - (1/slope)*log10((max - min)/(y - min)- 1)); | |
| } | |
| # define the logistic function |