Hi dear Patrick ,
Thanks for your replay. Below is a reproducible example . First, I generated
two similar Dfs with one column contains the interval. Then, I put the 2 dfs
in a list. Now, converting this list into df provides different results
depending on the code. See below for more details.
# dataframe 1
id <- c(1,1)
dates1 <- c("2010/2/4","2011/2/4")
dates2 <- c("2010/9/4","2011/1/1")
df1 <- data.frame(id,dates1,dates2)
df1[,2] <- as.Date(df1[,2])
df1[,3] <- as.Date(df1[,3])
df1$interaction <-
intersect(interval(df1[1,2],df1[2,2]),interval(df1[1,3],df1[2,3]))
# Dataframe 2
id <- c(2,2)
dates1 <- c("2010/1/4","2011/2/4")
dates2 <- c("2010/10/4","2011/1/16")
df2 <- data.frame(id,dates1,dates2)
df2[,2] <- as.Date(df1[,2])
df2[,3] <- as.Date(df1[,3])
df2$interaction <-
intersect(interval(df1[1,2],df1[2,2]),interval(df1[1,3],df1[2,3]))
# 2 datframes in a list :
ListOfDFs <- list(df1,df2)
# Convert list of Dfs into a single df :-
SingDF <- ldply( ListOfDFs,data.frame)
# The interval has been converted into numbers which is not what I want.
#but trying this code :
SingDF <- do.call(rbind,ListOfDFs)
# It works perfectly but only with this example as we have only 2
datframes. Howver, in my actual data I have around 8000 datframes. Applying
this code to it , make R code freezes and I waited for many hours but it still
freezes with no results generated.
Could anyone please suggest any alternative syntax or modifications to the
codes above?
Kind Regards
Sent from Outlook
________________________________
From: Patrick (Malone Quantitative) <mal...@malonequantitative.com>
Sent: 24 December 2019 17:01:59
To: Allaisone 1 <allaiso...@hotmail.com>
Cc: r-help@r-project.org <r-help@r-project.org>
Subject: Re: [R] Time intervals is converted into seconds after converting list
of dfs into a single Df.
You didn't provide a reproducible example for testing (or post in
plain text), but lubridate has an as.interval() function. You'll need
to be able to extract the start time, though, for use in the function.
On Tue, Dec 24, 2019 at 11:54 AM Allaisone 1 <allaiso...@hotmail.com> wrote:
>
>
> Hi dear group ,
>
> I have list of datframes with similar column names. I want to rebind all
> dataframes so I have a single dataframe. One of the column's in each df is of
> 'interval' time class which was generated from 'lubridate' package.
>
> The problem is that when I convert the list of dfs into a single df using any
> of the below codes :
>
> Library(plyr)
> MySingleDf <- ldply(MyListOfDfs, data.frame)
> Or
> MySingleDf <- ldply(MyListOfDfs, rbind)
> Or
> MySingleDf <- rebind. fill (MyListOfDfs)
>
> What heppens is that time intervals which looks like : 2010-4-5
> UTC--2011-7-9 UTC is converted into a single numeric value which seems to be
> the difference between the 2 dates in seconds.
>
> When I use :
> MySingleDf <- do.call ("rbind",MyListOfDfs)
>
> The code is freezes and it shows like of the data are being analysed but no
> result. I have used this code previously for the same purpose but with
> another datse and it works perfectly.
>
> What I want to see is that time intervals are shown as they are but not
> converted into seconds.
>
> Could you please suggest any alternative syntax or modifications to my codes ?
>
> Thank you so much in advance
>
> Regards
>
>
>
> [[alternative HTML version deleted]]
>
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