[R] Trying to fix code that will find highest 5 column names and their associated values for each row in a data frame in R

[PIKAL Petr]

Hi

generated DF is not what you expect it is

>   set.seed(1)
>   DF <- matrix(sample(1:9,9),ncol=10,nrow=9)
> DF
      [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
 [1,]    3    3    3    3    3    3    3    3    3     3
 [2,]    9    9    9    9    9    9    9    9    9     9
 [3,]    5    5    5    5    5    5    5    5    5     5
 [4,]    6    6    6    6    6    6    6    6    6     6
 [5,]    2    2    2    2    2    2    2    2    2     2
 [6,]    4    4    4    4    4    4    4    4    4     4
 [7,]    8    8    8    8    8    8    8    8    8     8
 [8,]    7    7    7    7    7    7    7    7    7     7
 [9,]    1    1    1    1    1    1    1    1    1     1
>

with slight input modification

> set.seed(1)
> DF <- matrix(sample(1:9,90, replace=T), ncol=10, nrow=9)
>   DF <- as.data.frame.matrix(DF)
>

> out <- t(apply(DF, 1, function(x){
+     o <- head(order(-x), 5)
+     paste0(names(x[o]), ':', x[o])
+   }))
>   as.data.frame(out)
    V1   V2    V3   V4    V5
1 V5:8 V6:8 V10:7 V3:4  V4:4
2 V4:8 V3:7  V8:6 V1:4  V9:4
3 V3:9 V5:7  V1:6 V6:5  V9:5
4 V1:9 V9:9  V2:7 V6:7 V10:7
5 V5:8 V9:8  V6:7 V8:7  V3:6
6 V1:9 V2:7 V10:7 V5:6  V4:5
7 V1:9 V7:9  V5:8 V6:8  V8:8
8 V9:9 V4:8  V2:7 V1:6  V5:5
9 V2:9 V8:8  V4:7 V1:6  V5:5

your code seems to work.
Cheers
Petr

> -----Original Message-----
> From: R-help <r-help-bounces using r-project.org> On Behalf Of Tom Woolman
> Sent: Monday, December 17, 2018 6:34 PM
> To: r-help using r-project.org
> Subject: [R] Trying to fix code that will find highest 5 column names and their
> associated values for each row in a data frame in R
>
>
> I have a data frame each with 10 variables of integer data for various
>   attributes about each row of data, and I need to know the highest 5 variables
> related to each of
>   row in this data frame and output that to a new data frame. In addition to
>   the 5 highest variable names, I also need to know the corresponding 5
>   highest variable values for each row.
>
>   A simple code example to generate a sample data frame for this is:
>
>   set.seed(1)
>   DF <- matrix(sample(1:9,9),ncol=10,nrow=9)
>   DF <- as.data.frame.matrix(DF)
>
>
> This would result in an example data frame like this:
>
>   #   V1 V2 V3 V4 V5 V6 V7 V8 V9 V10
>   # 1  3  2  5  6  5  2  6  8  1   3
>   # 2  1  4  7  8  7  7  3  4  2   9
>   # 3  2  3  4  7  5  8  9  1  3   5
>   # 4  3  8  3  4  5  6  7  4  6   5
>   # 5  6  2  3  7  2  1  8  3  2   4
>   # 6  8  2  4  8  3  2  9  7  6   5
>   # 7  1  5  3  6  8  3  8  9  1   3
>   # 8  9  3  5  8  4  9  7  8  1   2
>   # 9  1  2  4  8  3  2  1  2  5   6
>
>
>   My ideal output would be something like this:
>
>
>   #      V1   V2   V3   V4   V5
>   # 1  V2:9 V7:8 V8:7 V4:6 V3:5
>   # 2  V9:9 V3:8 V5:7 V7:6 V4:5
>   # 3  V5:9 V3:8 V2:7 V9:6 V7:5
>   # 4  V8:9 V4:8 V2:7 V5:6 V9:5
>   # 5  V9:9 V1:8 V6:7 V3:6 V5:5
>   # 6  V8:9 V1:8 V5:7 V9:6 V4:5
>   # 7  V2:9 V8:8 V7:7 V5:6 V9:5
>   # 8  V4:9 V7:8 V9:7 V2:6 V8:5
>   # 9  V3:9 V7:8 V8:7 V4:6 V5:5
>   # 10 V6:9 V8:8 V1:7 V9:6 V4:5
>
>
>   I was trying to use code, but this doesn't seem to work:
>
>   out <- t(apply(DF, 1, function(x){
>     o <- head(order(-x), 5)
>     paste0(names(x[o]), ':', x[o])
>   }))
>   as.data.frame(out)
>
>
>
>   Thanks everyone!
>
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