Jill Sellum - 2 months ago 22

R Question

Here's the challenge i am facing. I am trying to transform this dataset

`a b c`

100 0 111

0 137 17

78 117 91

into (column to rows)

`col1 col2`

a 100,78

b 137,117

c 111,17,91

I know I can do this using

`reshape`

`melt`

Answer

I would use `dplyr`

rather than reshape.

```
library(dplyr)
library(tidyr)
Data <- data.frame(a=c(100,0,78),b=c(0,137,117),c=c(111,17,91))
Data %>%
gather(Column, Value) %>%
filter(Value != 0) %>%
group_by(Column) %>%
summarize(Value=paste0(Value,collapse=', '))
```

The gather function is similar to `melt`

in `reshape`

. The `group_by`

function tells later functions that you want to seperate based off of values in `Column`

. Finally `summarize`

calculates whatever summary we want for each of the groups. In this case, paste all the terms together.

Which should give you:

```
# A tibble: 3 × 2
Column Value
<chr> <chr>
1 a 100, 78
2 b 137, 117
3 c 111, 17, 91
```