Tena koe Yann It may not be the only problem, but you are missing an operator between (bb0+x+1) and (bb1-x-1).
HTH .... Peter Alspach > -----Original Message----- > From: r-help-boun...@r-project.org > [mailto:r-help-boun...@r-project.org] On Behalf Of yann lancien > Sent: Wednesday, 10 June 2009 9:31 a.m. > To: r-help@r-project.org > Subject: [R] Problem : solving a equation with R , fail with > uniroot function > > Hi , > I would like to know if a R function have the same behaviour > than the matlab solve function. > I tried something with uniroot but I have some problems: > The equation I need to solve is : > exp(c0-r0)*(bb0+x)*(bb1-x)=(bb0+x+1)(bb1-x-1) > > So I tried this: > > STEP 1: my function test > test <- function(x,bb0=-3,bb1=5,c0=2,r0=0) { > + ((exp(c0-r0)*(bb0+x)*(bb1-x))/((bb0+x+1)(bb1-x-1))-1)} > > STEP 2: > > uniroot(test,c(-100,100))$root* > Erreur dans f(lower, ...) : > tentative d'appliquer un objet qui n'est pas une fonction* > > R tells me that test is not a function ... > > STEP 3: > > is.function(test) > [1] TRUE > > > Thanks, > Yann > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > The contents of this e-mail are confidential and may be subject to legal privilege. If you are not the intended recipient you must not use, disseminate, distribute or reproduce all or any part of this e-mail or attachments. If you have received this e-mail in error, please notify the sender and delete all material pertaining to this e-mail. Any opinion or views expressed in this e-mail are those of the individual sender and may not represent those of The New Zealand Institute for Plant and Food Research Limited. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
