[R] non-standard reshape from long to wide

Yuan Chun Ding ycd|ng @end|ng |rom coh@org
Thu Jan 7 21:40:18 CET 2021

Hi Rui,

Thank you so much!!   You code works well and I am looking into the pivot_wider function.

Yuan Ding

-----Original Message-----
From: Rui Barradas [mailto:ruipbarradas using sapo.pt] 
Sent: Thursday, January 7, 2021 12:19 PM
To: Yuan Chun Ding <ycding using coh.org>; r-help using r-project.org
Subject: Re: [R] non-standard reshape from long to wide


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


df.long %>%
   mutate(values = 1) %>%
     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");
> ----------------------------------------------------------------------
> ------------------------------------------------------------
> This message and any attachments are intended solely for the individual or entity to which they are addressed. This communication may contain information that is privileged, confidential, or exempt from disclosure under applicable law (e.g., personal health information, research data, financial information). Because this e-mail has been sent without encryption, individuals other than the intended recipient may be able to view the information, forward it to others or tamper with the information without the knowledge or consent of the sender. If you are not the intended recipient, or the employee or person responsible for delivering the message to the intended recipient, any dissemination, distribution or copying of the communication is strictly prohibited. If you received the communication in error, please notify the sender immediately by replying to this message and deleting the message and any accompanying files from your system. If, due to the security risks, you do not wish to receive further communications via e-mail, please reply to this message and inform the sender that you do not wish to receive further e-mail from the sender. (LCP301)
> ______________________________________________
> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://urldefense.com/v3/__https://stat.ethz.ch/mailman/listinfo/r-help__;!!Fou38LsQmgU!9ccbhtYzBJoahdschhouzo2kkluOs-EdoH8jn32fv9E22xaJ4GzfrI0bOvVl$ 
> PLEASE do read the posting guide https://urldefense.com/v3/__http://www.R-project.org/posting-guide.html__;!!Fou38LsQmgU!9ccbhtYzBJoahdschhouzo2kkluOs-EdoH8jn32fv9E22xaJ4GzfrKjC2095$ 
> and provide commented, minimal, self-contained, reproducible code.

More information about the R-help mailing list