[R] Manipulations of a data frame or list -- rename or re-assign?
If I am to do a lot of pre-processing operations on some data, comprising many steps such as: -- despike a set of signals -- smooth a set of signals -- filter -- subset -- impute missing values etc... Should I be assigning the result of each operation to a new object, and then destroying the old one, or is it fine to reassign the object to itself? df - sapply(df, someFunction, arg=10) OR df.new - sapply(df, someFunction, arg=10) Ben University of Melbourne __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Manipulations of a data frame or list -- rename or re-assign?
Hello, Maybe you could keep the original, and reuse only one (another) object for the intermidiate steps. That's how I would do it. Hope this helps, Rui Barradas Em 03-08-2013 12:27, Ben Harrison escreveu: If I am to do a lot of pre-processing operations on some data, comprising many steps such as: -- despike a set of signals -- smooth a set of signals -- filter -- subset -- impute missing values etc... Should I be assigning the result of each operation to a new object, and then destroying the old one, or is it fine to reassign the object to itself? df - sapply(df, someFunction, arg=10) OR df.new - sapply(df, someFunction, arg=10) Ben University of Melbourne __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Manipulations of a data frame or list -- rename or re-assign?
On 08/03/2013 09:27 PM, Ben Harrison wrote: If I am to do a lot of pre-processing operations on some data, comprising many steps such as: -- despike a set of signals -- smooth a set of signals -- filter -- subset -- impute missing values etc... Should I be assigning the result of each operation to a new object, and then destroying the old one, or is it fine to reassign the object to itself? df- sapply(df, someFunction, arg=10) OR df.new- sapply(df, someFunction, arg=10) Hi Ben, If you have read the initial data in from a file you can just use the original name. If you don't have another copy of the initial data, it is best to save it (e.g. write.table, save) before overwriting the object. Fundamentally, don't destroy an object that you can't easily recreate. Jim __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
