On 22-05-2014, at 14:35, message <let...@openmailbox.org> wrote: > On 2014-05-22 11:00, Berend Hasselman wrote: >>>> uniroot(function(x) 5*x - 55, c(0, 10)) >>> Error in uniroot(function(x) 5 * x - 55, c(0, 10)) : >>> f() values at end points not of opposite sign >> I don’t believe this. >> The error message says it all. >> 5*0-55 ==> -55 >> 5*10-55 ==> -5 > > The error states "opposite sign", which suggests to a rudimentary novice that > end points (0 and 10, or 0 and 20) must give results of the function such > that one value is negative, another value is positive. Or is this > interpretation wrong? >
No. It is exactly what the error message says. Both function values are negatieve i.e. not of opposite sign. Which is why you got the error message. >> See the Details section of the uniroot documentation. > > The documentation states that the upper end point (in this example 10, or 20) > must be strictly larger than the lower point (0). What is being > mis-understood please? > Read the sentences after the first. Berend ______________________________________________ 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.
