Just to update this f[35.99,36.22] works fine and returns the data from f[35,36] it does this rounding the R itself.
the problem finally was a value f[0.99,3] that was returning numeric(0) which I understand as a matrix doesnot have any f[0,0] Regards Alex --- On Thu, 11/18/10, Sarah Goslee <sarah.gos...@gmail.com> wrote: From: Sarah Goslee <sarah.gos...@gmail.com> Subject: Re: [R] why help ignores some values To: "Alaios" <ala...@yahoo.com> Cc: "Rhelp" <r-help@r-project.org> Date: Thursday, November 18, 2010, 11:27 AM Possibly because R has no idea what the 35.999999999999872-th element of a matrix is? However you are coming up with these elements, you are running into a floating-point arithmetic problem (FAQ 7.31). Using round() might help. Sarah On Thu, Nov 18, 2010 at 6:19 AM, Alaios <ala...@yahoo.com> wrote: > Please take a look at the values below > ................. > [31,] 30.000000000000000 30.000000000000000 > [32,] 31.000000000000000 31.000000000000000 > [33,] 32.000000000000000 32.000000000000000 > [34,] 33.000000000000000 33.000000000000000 > [35,] 34.000000000000000 34.000000000000000 > [36,] 35.000000000000000 35.000000000000000 > [37,] 35.999999999999872 35.999999999999872 > > > These are entries in an array. These values are used as indexes inside a > matrix. > f[shweights[37,1],shweights[37,2]] works fine for me and returns correctly > the value. > > but when I try > f[shweights[,1],shweights[,2]] > I only get 36 out of 37 results (seems that in that case ignores the last > values, 37th) > ..... > [35,] 2.7245297165175781 > [36,] 2.7245297165175781 > > Why this might be happening? > Regards > Alex > > -- Sarah Goslee http://www.functionaldiversity.org [[alternative HTML version deleted]]
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