[R] Help: ifelse selection for x,y coordinates

[Céline Lüscher]

Hi Jim,

Thank you very much for the answer ! The result is really better with this 😊

Here is the code :
> kk<- function(x.Koordinate, y.Koordinate, data=data) 
+ { 
+   coordx<-data$x.Koordinate[data$G==24]
+   coordy<-data$y.Koordinate[data$G==24]
+   x <- ifelse(data$x.Koordinate>coordx-51 & data$G>15,data$x.Koordinate," ")
+   y<-ifelse(data$y.Koordinate>coordy-51 & data$G>15,data$y.Koordinate," ")
+   xy<-as.data.frame(list(x,y))
+   names(xy)<-c("x","y")
+   return(xy)
+ }
> kk(x.Koordinate, y.Koordinate, data=data)
        x      y
1               
2               
3               
4               
5               
6  205550       
7  205550 604100
8               
9  205600 604150
10 205600 604100

Best regards,
C.


Gesendet von Mail für Windows 10

Von: Jim Lemon
Gesendet: vendredi, 23 juin 2017 05:28
An: Céline Lüscher
Cc: r-help at r-project.org
Betreff: Re: [R] Help: ifelse selection for x,y coordinates

Hi Celine,
Perhaps if you modify your return value like this:

xy<-as.data.frame(list(x,y))
names(xy)<-c("x","y")
return(xy)

Jim

On Thu, Jun 22, 2017 at 6:48 PM, Céline Lüscher <c-luescher at hispeed.ch> wrote:
> Hi everyone,
> My database has 3 columns : the x coordinates, the y coordinates and the value of G for every individual (20 in total). I would like to have the x,y coordinates of individuals, Under these conditions : the distance to the reference coordinates must be under or equal to 50 meters + the value of G must be bigger or equal to 16.
>
> Here’s what I’ve done first :
>
>> kk<- function(x, y)
> + {
> +   coordx<-data$x.Koordinate[data$G==24]
> +   coordy<-data$y.Koordinate[data$G==24]
> +   x <- ifelse(data$x.Koordinate>coordx-51 & data$G>15,data$x.Koordinate,0)
> +   y<-ifelse(data$y.Koordinate>coordy-51 & data$G>15,data$y.Koordinate,0)
> +   return(c(x,y))
> + }
>> kk(data$x.Koordinate, data$y.Koordinate)
>  [1]      0      0      0      0      0 205550 205550      0 205600 205600      0      0      0      0      0      0      0
> [18] 604100      0 604150 604100      0
>
> The problem here is that we can not clearly see the difference between the coordinates for x and the ones for y.
>
> Then I tried this :
>> kk<- function(x, y)
> + {
> +   coordx<-data$x.Koordinate[data$G==24]
> +   coordy<-data$y.Koordinate[data$G==24]
> +   x <- ifelse(data$x.Koordinate>coordx-51 & data$G>15,data$x.Koordinate," ")
> +   y<-ifelse(data$y.Koordinate>coordy-51 & data$G>15,data$y.Koordinate," ")
> +   return(list(x,y))
> + }
>> kk(data$x.Koordinate, data$y.Koordinate)
> [[1]]
>  [1] " "      " "      " "      " "      " "      "205550" "205550" " "      "205600" "205600" " "
>
> [[2]]
>  [1] " "      " "      " "      " "      " "      " "      "604100" " "      "604150" "604100" " "
>
>>
>
> Where we can see better the two levels related to the x and y coordinates.
>
> My question is simple : Is it possible for this function to return the values in a form like x,y or x y ? (without any 0, or « », or space) Or should I use another R function to obtain this result ?
>
> Thank you for your help, and sorry for the English mistakes,
> C.
>
>
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>
>
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