[R] create sequence of numbers

[Dimitris Rizopoulos]

one way is to use the sign() function, e.g.,

a <- 2
b <- 3
seq(a, b, by = sign(b-a)*0.5)

a <- 3
b <- 2
seq(a, b, by = sign(b-a)*0.5)


I hope it helps.

Best,
Dimitris


On 10/22/2010 11:58 AM, Alaios wrote:
> Hello.
> I want to create some sequence of numbers . So far I used sequence which does
> not work always
>
> seq(CRagent[[1]]$xy[1],CRagent[[2]]$xy[1],by=0.01)
> Error in seq.default(CRagent[[1]]$xy[1], CRagent[[2]]$xy[1], by = 0.01) :
>    wrong sign in 'by' argument
> Calls: seq ->  seq.default
>
>
> if the parameters are in descending form.
>
>
> The ideal would be to be able to use seq like this
>
> seq(2,3,by=0.5) -->  2,2.5,3
> seq(3,2,by=0.5)-->3,2.5,2
>
> Could you please help me implement this?
>
> I wouldl ike to thank you in advance for your help
>
> Best Regards
> Alex
>
>
>
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>
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-- 
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center

Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
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