# [R] Conditions in R (Help Post)

jim holtman jho|tm@n @end|ng |rom gm@||@com
Tue Oct 22 20:28:32 CEST 2019

```Had the condition for phase=2 incorrect:

library(tidyverse)
input <- read_delim(" YEAR   DAY      X     Y   Sig
1981     9 -0.213 1.08   1.10
1981    10  0.065 1.05   1.05", delim = ' ', trim_ws = TRUE)

input <- mutate(input,
phase = case_when(X < 0 & Y < 0 & Y < X ~ 'phase=1',
X < 0 & Y < 0 & Y > X ~ 'phase=2',
X < 0 & Y > 0 & Y < X ~ 'phase=7',
X < 0 & Y > 0 & Y > X ~ 'phase=8',
X > 0 & Y < 0 & Y < X ~ 'phase=3',
X > 0 & Y < 0 & Y > X ~ 'phase=4',
X > 0 & Y > 0 & Y > X ~ 'phase=6',
X > 0 & Y > 0 & Y < X ~ 'phase=5',
TRUE ~ 'unknown'
)
)

Jim Holtman
*Data Munger Guru*

*What is the problem that you are trying to solve?Tell me what you want to
do, not how you want to do it.*

On Tue, Oct 22, 2019 at 11:20 AM jim holtman <jholtman using gmail.com> wrote:

> Here is one way of doing it; I think the output you show is wrong:
>
> library(tidyverse)
> input <- read_delim(" YEAR   DAY      X     Y   Sig
>   1981     9 -0.213 1.08   1.10
>   1981    10  0.065 1.05   1.05", delim = ' ', trim_ws = TRUE)
>
> input <- mutate(input,
>   phase = case_when(X < 0 & Y < 0 & Y < X ~ 'phase=1',
>                     X < 0 & Y > 0 & Y < X ~ 'phase=2',
>                     X < 0 & Y > 0 & Y < X ~ 'phase=7',
>                     X < 0 & Y > 0 & Y > X ~ 'phase=8',
>                     X > 0 & Y < 0 & Y < X ~ 'phase=3',
>                     X > 0 & Y < 0 & Y > X ~ 'phase=4',
>                     X > 0 & Y > 0 & Y > X ~ 'phase=6',
>                     X > 0 & Y > 0 & Y < X ~ 'phase=5',
>                     TRUE ~ 'unknown'
>   )
> )
>
> > input
> # A tibble: 2 x 6
>    YEAR   DAY      X     Y   Sig phase
>   <dbl> <dbl>  <dbl> <dbl> <dbl> <chr>
> 1  1981     9 -0.213  1.08  1.1  phase=8
> 2  1981    10  0.065  1.05  1.05 phase=6
>
> Jim Holtman
> *Data Munger Guru*
>
>
> *What is the problem that you are trying to solve?Tell me what you want to
> do, not how you want to do it.*
>
>
> On Tue, Oct 22, 2019 at 9:43 AM Yeasmin Alea <yeasmin.alea using gmail.com>
> wrote:
>
>> Hello Team
>> I would like to add a new column (for example-Phase) from the below data
>> set based on the conditions
>>    YEAR   DAY      X     Y   Sig
>>  1  1981     9 -0.213 1.08   1.10
>>  2  1981    10  0.065 1.05   1.05
>> *Conditions*
>>
>> D\$Phase=sapply(D,function(a,b) {
>>      a <-D\$X
>>      b<-D\$Y
>>      if (a<0 && b<0 && b<a)
>>     {phase=1} else if (a<0 && b<0 && b>a)
>>     {phase=2} else if (a<0 && b>0 && b<a)
>>     {phase=7} else if (a<0 && b>0 && b>a)
>>     {phase=8} else if (a>0 && b<0 && b<a)
>>     {phase=3} else if (a>0 && b<0 && b>a)
>>     {phase=4} else if (a>0 && b>0 && b>a)
>>     {phase=6} else (a>0 && b>0 && b<a)
>>     {phase=5}
>> })
>>
>> Can anyone help to fix the script to get a Phase column based on the
>> conditions. The table will be like the below
>>    YEAR   DAY      X     Y   Sig      Phase
>>  1  1981     9 -0.213 1.08   1.10   phase=7
>>  2  1981    10  0.065 1.05   1.05   phase=6
>>
>> Many thanks
>> Alea
>>
>>         [[alternative HTML version deleted]]
>>
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