Perfect - this works!!  -zubin

Peter Alspach wrote:
> Tena koe Zubin
>
> Would this work for your application:
>
> toPlot <- paste("X",i,sep="")
> plot(x[, toPlot])
>
> HTH ....
>
> Peter Alspach
>
>   
>> -----Original Message-----
>> From: r-help-bounces@r-project.org [mailto:r-help-bounces@r-
>> project.org] On Behalf Of zubin
>> Sent: Wednesday, 31 March 2010 2:25 p.m.
>> To: r-help@r-project.org
>> Subject: [R] creating a variable using concatenation
>>
>> A general problem i run into, i know there must be a simple solution.
>>
>> I like to create a variable by appending a 1 for example, (i need to
>> loop later on from 1 to X, thus the reason for this).   So i assign
>>     
> the
>   
>> variable vplot with this value, however it has quotes and when i use
>>     
> it
>   
>> in a barplot, it throws an error.  but the tcenter$X1 does exist, its
>> an
>> element of a data frame.  So if i type directly it works, but i like
>>     
> to
>   
>> do this programmatically, as i have to generate a bunch of these plots
>> and need to loop.
>>
>> So how do i concatenate to create a variable, then reference that
>> variable in a function call?
>>
>>
>> R> x <- data.frame(1,2,3,4,5,6,7,8)
>> R> x
>>   X1 X2 X3 X4 X5 X6 X7 X8
>> 1  1  2  3  4  5  6  7  8
>> R> x$X1
>> [1] 1
>>
>> R> i=1
>> R> toplot <- paste("x$X",i,sep="")
>> R> toplot
>> [1] "x$X1"
>>
>> okay lets test:
>>
>>  R> plot(x$X1)
>> -it works i see the plot
>>
>> however this DOES not work
>>
>> R> plot(toplot)
>>
>> Error in plot.window(...) : need finite 'ylim' values
>> In addition: Warning messages:
>> 1: In xy.coords(x, y, xlabel, ylabel, log) : NAs introduced by
>>     
> coercion
>   
>> 2: In min(x) : no non-missing arguments to min; returning Inf
>> 3: In max(x) : no non-missing arguments to max; returning -Inf
>>
>>
>> Thus, that's my problem, i know it must be simple -  the variable is
>> equal to x$X1 but it does not work in a function call?  i tried many
>> functions - always some type of error.
>>
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>> and provide commented, minimal, self-contained, reproducible code.
>>     
>
>   

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