Sigh. Google couldn't help you? Try FAQ 7.31 and then use non-fractions to generate sequences... scale as desired. This is not unique to R. --------------------------------------------------------------------------- Jeff Newmiller The ..... ..... Go Live... DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#. Live Go... Live: OO#.. Dead: OO#.. Playing Research Engineer (Solar/Batteries O.O#. #.O#. with /Software/Embedded Controllers) .OO#. .OO#. rocks...1k --------------------------------------------------------------------------- Sent from my phone. Please excuse my brevity.
Gewart <gew...@biotron.com.au> wrote: >Hi, Can anyone explain what is going on...!? For a vector >"x=seq(min,max,0.01)", when generating sub-vector "a" based on a >starting >value "st", things go as expected as long as "st" is not too close to >the >beginning of "x". For example, if x starts at -5 and increments by >0.01, >whenever I try to generate the sub-vector "a" (as below) with a >starting >value of 0.49 or less it does not generate the expected output: The >initial >value of "a" is wrong. > >Thanks in advance for any clarity you can shed. >Gary > >...(please see two versions of code below).... > >#THIS WORKS...(st > -4.9) > > min = -5; max = 1; x=seq(min,max,0.01) > > st= -4.8 ; end= 0 > > a=x[((st-min)/0.01+1):((end-min)/0.01+1)] > > n=(st-min)/0.01+1 >#compare > a[1:10]; c(x[n:(n+9)]) > >#test... > n > x[1:n]; x[n] ### x[n]== x[1:n][n] ; As expected >########################################################## ># BUT THIS IS WEIRD!!...(st <= -4.9) > > st= -4.90 ; end= 0 ### -> BUG in generation of a!! > > a=x[((st-min)/0.01+1):((end-min)/0.01+1)]; > > n=(st-min)/0.01+1 >#compare > a[1:10]; c(x[n:(n+9)]) >#test > n > x[1:n]; x[n] ### NOW x[n] != x[1:n][n] !!?? What is going on!? > > > > > >-- >View this message in context: >http://r.789695.n4.nabble.com/Strange-subvector-output-x-n-x-1-n-n-tp4682526.html >Sent from the R help mailing list archive at Nabble.com. > >______________________________________________ >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. ______________________________________________ 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.