# [R] categorizing data

Janet Choate j@c@eco @end|ng |rom gm@||@com
Mon May 30 07:21:42 CEST 2022

```Thank you - that did what I needed!
Thank you all for your help & feedback, very much appreciated!
JC

On Sun, May 29, 2022 at 10:07 PM Richard O'Keefe <raoknz using gmail.com> wrote:

> Suppose your data are in a table called plant.data
> Suppose you want to process row i.
> Then plant.data[i,] is a vector of 3 numbers.
> ord <- order(plant.data[i,])
> gives you a vector of 3 positive integers such
> that plant.data[i,ord] is in ascending order.
> plant.data[i,ord[1]] <- 10
> plant.data[i,ord[2]] <- 30
> plant.data[i,ord[3]] <- 50
> or even
> plant.data[i,ord] <- c(10,30,50)
> Wrapping it up and tying a bow on it:
> new.values <- c(10,30,50)
> for (i in 1:nrow(plant.data))
>     plant.data[i,order(plant.data[i,])] <- new.values
>
> > plant.orig <- data.frame(
> + tree = c(32,23,49),
> + shrub = c(11,41,23),
> + grass = c(47,26,18))
> > plant.orig
>   tree shrub grass
> 1   32    11    47
> 2   23    41    26
> 3   49    23    18
> > new.values <- c(10,30,50)
> > plant.new <- plant.orig
> > for (i in 1:nrow(plant.new))
> +     plant.new[i,order(plant.new[i,])] <- new.values
> > plant.new
>   tree shrub grass
> 1   30    10    50
> 2   10    50    30
> 3   50    30    10
>
>
> On Mon, 30 May 2022 at 07:29, Janet Choate <jsc.eco using gmail.com> wrote:
>
>> Hi R community,
>> I have a data frame with three variables, where each row adds up to 90.
>> I want to assign a category of low, medium, or high to the values in each
>> row - where the lowest value per row will be set to 10, the medium value
>> set to 30, and the high value set to 50 - so each row still adds up to 90.
>>
>> For example:
>> Data: Orig
>> tree  shrub  grass
>> 32     11       47
>> 23      41      26
>> 49      23      18
>>
>> Data: New
>> tree  shrub  grass
>> 30      10      50
>> 10       50     30
>> 50       30     10
>>
>> I am not attaching any code here as I have not been able to write anything
>> effective! appreciate help with this!
>> thank you,
>> JC
>>
>> --
>>
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>>
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>>
>

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UCSB, Santa Barbara, CA.

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