[R] Scaling X axis from -1 to 1

[David Winsemius]

On Sep 15, 2008, at 9:49 PM, Gundala Viswanath wrote:

> Dear Jim,
>
> I cannot find the function "rescale".
> Does it belong to any particular package?
>
> - Gundala Viswanath
> Jakarta - Indonesia

Marc's plotrix theory certainly looks probable, but a Google search  
also produced:

<http://cran.r-project.org/doc/contrib/Lemon-kickstart/rescale.R>

... and for some reason Google did not rank a link to the plotrix  
package highly enough to be on the first two pages. Appears that the  
two functions handle exception trapping somewhat differently. The  
material in Kickstarting-R looks top-notch for us beginners.

R Site Search produced quite a few other rescale() or rescale work  
alikes.

-- 
David Winsemius
Heritage Labs

-- 
>
>
>
>
> On Mon, Sep 15, 2008 at 5:24 PM, Jim Lemon <jim at bitwrit.com.au> wrote:
>> Gundala Viswanath wrote:
>>>
>>> Hi,
>>>
>>> I have a density plot in which the x axis
>>> ranged from 0 to 2000.
>>>
>>> How can I scale the data so that the x-axis
>>> is scaled in -1 to 1 form?
>>>
>>>
>>
>> Hi Gundala,
>> If your data is named "mydata":
>>
>> mynewdata<-rescale(mydata,c(-1,1))
>>
>> This will linearly transform "mydata" into the range -1 to 1. You  
>> may also
>> want to manually create the axis on the plot:
>>
>> plot(mynewdata,axes=FALSE,...)
>> box()
>> axis(1)
>> axis(2,at=c(-1,0,1),labels=c("0","1000","2000"))
>>
>> If you want the original values.
>>
>> Jim
>>
>> axis
>>
>
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