[R] In R 2.14.1, what does wrong sign in 'by' argument mean?

[David L Carlson]

Don't delete the context of the message. If you are sure that windowsize is
positive, are you also sure that it is less than length(inputseq)?

> seq(1, -10, 1)
Error in seq.default(1, -10, 1) : wrong sign in 'by' argument

----------------------------------------------
David L Carlson
Associate Professor of Anthropology
Texas A&M University
College Station, TX 77843-4352


Date: Tue, 21 Feb 2012 11:43:15 -0800 (PST)
From: bioinformatics <uccstudent at live.ie>
To: r-help at r-project.org

Thats all well and good but the number im using is a positive so that
shouldn't be happening.

--

From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of Richard M. Heiberger
Sent: Tuesday, February 21, 2012 1:36 PM
To: bioinformatics
Cc: r-help at r-project.org
Subject: Re: [R] In R 2.14.1, what does wrong sign in 'by' argument mean?

> seq(1,4,1)
[1] 1 2 3 4
> seq(1,4,-1)
Error in seq.default(1, 4, -1) : wrong sign in 'by' argument
>

On Tue, Feb 21, 2012 at 1:53 PM, bioinformatics <uccstudent at live.ie> wrote:

> Here is my code
>
>
>    slidingwindowplotATGC = function(windowsize, inputseq)
>    {
>
>    starts = seq(1, length(inputseq)-windowsize, by = windowsize)
>    n = length(starts)
>    chunkGs = numeric(n)
>    chunkAs = numeric(n)
>    chunkTs = numeric(n)
>    chunkCs = numeric(n)
>    for (i in 1:n) {
>        chunk = windowsize[starts[i]:(starts[i]+9999)]
>        chunkG = sum("g" == chunk)/length(chunk)
>        chunkA = sum("a" == chunk)/length(chunk)
>        chunkT = sum("t" == chunk)/length(chunk)
>        chunkC = sum("c" == chunk)/length(chunk)
>          chunkGs[i] = chunkG
>        chunkAs[i] = chunkA
>          chunkTs[i] = chunkT
>          chunkCs[i] = chunkC
>        }
>
>
>
plot(starts,chunkGs,type="b",ylim=c(min(min(chunkAs),min(chunkTs),min(chunkC
s),min(chunkGs)),max(max(chunkAs),max(chunkTs),max(chunkCs),max(chunkGs))),c
ol
> = "red")
>    points(starts,chunkTs,col = "blue")
>    points(starts,chunkAs,col = "green")
>    points(starts,chunkCs)
> }
>
>
> Im getting the following error message,
>
>    Error in seq.default(1, length(inputseq) - windowsize, by = windowsize)
> :
>      wrong sign in 'by' argument
>
>
> which I never got before when running codes of this sort, infact I re ran
> old code that worked perfectly before, except this time Im getting this
> error message which doesn't seem to make any sense at all! I need help
with
> this before I go completely insane... Maybe Im just bad at this program,
> but
> it seems to me that it has a mind of its own... I was also getting an
error
> message before regarding the ylim function, stating that it needed to be a
> finite value, which is what I was giving it? HELP!!!
>
> --
> View this message in context:
>
http://r.789695.n4.nabble.com/In-R-2-14-1-what-does-wrong-sign-in-by-argumen
t-mean-tp4407926p4407926.html
> Sent from the R help mailing list archive at Nabble.com.
>
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> PLEASE do read the posting guide
>
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> and provide commented, minimal, self-contained, reproducible code.
>

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