This is maybe not the most elegant way, but it does de job. You first  
put f$RM values in negative form. Then you plot your graph without the  
x axis labels. After, you create the labels you want.

Try this :

f <- (structure(list(TKN = c(0.103011025, 0.018633208, 0.104235702,
0.074537363, 0.138286096), RM = c(215, 198, 148, 119, 61)), .Names =  
c("TKN",
"RM"), class = "data.frame", row.names = 25:29))

f$rms=f$RM*(-1)
plot(f$TKN~f$rms ,xaxt="n", type="b")

axis(side=1, seq(min(pretty(f$rms,n=3)),max(pretty(f$rms,n=3)),50),  
labels=seq(min(pretty(f$rm,n=3))*(-1),max(pretty(f$rm,n=3))*(-1),-50))


Benoit Bruneau
Canada


On Apr 8, 2008, at 3:52 PM, stephen sefick wrote:

> On Tue, Apr 8, 2008 at 3:52 PM, stephen sefick <ssefick@gmail.com>  
> wrote:
>> Sorry, to have the x-axis to go from 200 to 0 or to reverse the x
>> points-  the line starts on the left hand side of the graph at   
>> x=215,
>> y=0.10301103   ...   and end with x=61, y=0.13828610. does this make
>> sense?  reverse order x-axis in excel is what I would use if this
>> helps
>>
>>
>>
>> On Tue, Apr 8, 2008 at 3:43 PM, Henrique Dallazuanna <wwwhsd@gmail.com 
>> > wrote:
>>> Try:
>>>
>>> plot(f$RM~f$TKN, type="b")
>>>
>>>
>>>
>>>
>>> On Tue, Apr 8, 2008 at 4:18 PM, stephen sefick <ssefick@gmail.com>  
>>> wrote:
>>>>
>>>>
>>>>
>>>> #copy and paste this into R
>>>> f <- (structure(list(TKN = c(0.103011025, 0.018633208, 0.104235702,
>>>> 0.074537363, 0.138286096), RM = c(215, 198, 148, 119,  
>>>> 61)), .Names =
>>> c("TKN",
>>>> "RM"), class = "data.frame", row.names = 25:29))
>>>> plot(f$TKN~f$RM, type="b")
>>>>
>>>> I would like to reverse the X-Axis.  How do I do this?
>>>>
>>>> --
>>>> Let's not spend our time and resources thinking about things that  
>>>> are
>>>> so little or so large that all they really do for us is puff us  
>>>> up and
>>>> make us feel like gods. We are mammals, and have not exhausted the
>>>> annoying little problems of being mammals.
>>>>
>>>>       -K. Mullis
>>>>
>>>>
>>>> ______________________________________________
>>>> 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.
>>>>
>>>
>>>
>>>
>>> --
>>> Henrique Dallazuanna
>>> Curitiba-Paraná-Brasil
>>> 25° 25' 40" S 49° 16' 22" O
>>
>>
>>
>> --
>>
>>
>> Let's not spend our time and resources thinking about things that are
>> so little or so large that all they really do for us is puff us up  
>> and
>> make us feel like gods. We are mammals, and have not exhausted the
>> annoying little problems of being mammals.
>>
>>        -K. Mullis
>>
>
>
>
> -- 
> Let's not spend our time and resources thinking about things that are
> so little or so large that all they really do for us is puff us up and
> make us feel like gods. We are mammals, and have not exhausted the
> annoying little problems of being mammals.
>
> 	-K. Mullis
>
> ______________________________________________
> 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.


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