[R] non-standard reshape from long to wide

Rui Barradas ru|pb@rr@d@@ @end|ng |rom @@po@pt
Thu Jan 7 21:19:11 CET 2021


Hello,

Here is a dplyr solution. The main trick is to create a column of 1's, 
then pipe to pivot_wider.


library(dplyr)
library(tidyr)

df.long %>%
   mutate(values = 1) %>%
   pivot_wider(
     id_cols = sample,
     names_from = marker,
     values_from = values,
     values_fill = NA
   )


Note: your df.wide is not a data.frame, the transpose coerces it to 
matrix. In this case it doesn't matter because it was just an example of 
expected output but in other, real use cases you must be careful.

df.wide <- as.data.frame(df.wide)

would solve it.


Hope this helps,

Rui Barradas

Às 18:39 de 07/01/21, Yuan Chun Ding escreveu:
> Dear R user,
> 
> I want to reshape a long data frame to wide format, I made the following example files.  Can you help me?
> 
> Thank you,
> 
> Yuan Chun Ding
> 
> sample <-c("xr" , "xr" , "fh" , "fh" , "fh" , "uy" , "uy" , "uy" , "uy");
> marker <-c("x" , "y" , "g" , "x" , "k" , "y" , "x" , "u" , "j");
> df.long <-data.frame(sample, marker);
>             
> xr <-c(1,1,NA,NA,NA,NA);
> fh <-c(1,NA,1,1,NA,NA);
> uy <-c(1,1,NA,NA,1,1);
> 
> df.wide <- t(data.frame(xr,fh,uy));
> colnames(df.wide)<-c("x","y","g","k", "u","j");
> 
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