Why can't I rename a data frame column inside a list?

Posted by Moreno Garcia on Stack Overflow See other posts from Stack Overflow or by Moreno Garcia
Published on 2014-06-03T00:29:45Z Indexed on 2014/06/03 9:25 UTC
Read the original article Hit count: 178

Filed under:

list

|

dataframes

|

names

I would like to rename some columns from CPU_Usage to the process name before I merge the dataframes in order to make it more legible.

names(byProcess[[1]])
# [1] "Time"      "CPU_Usage"
names(byProcess[1])
# [1] "CcmExec_3344"
names(byProcess[[1]][2]) <- names(byProcess[1])
names(byProcess[[1]][2])
# [1] "CPU_Usage"
names(byProcess[[1]][2]) <- 'test'
names(byProcess[[1]][2])
# [1] "CPU_Usage"
lapply(byProcess, names)
# $CcmExec_3344
# [1] "Time"      "CPU_Usage"
#
# ... (removed several entries to make it more readable)
#
# $wrapper_1604
# [1] "Time"      "CPU_Usage"

© Stack Overflow or respective owner

Related posts about list

kernel module compiling error

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
sh@ubuntu:/home/ccpp/helloworld$ make gcc-4.6 -O2 -DMODULE -D_KERNEL_ -W -Wall -Wstrict-prototypes -Wmissing-prototypes -isystem /lib/modules/`uname -r`/build/include -c -o hello-1.o hello-1.c hello-1.c:4:0: warning: "MODULE" redefined [enabled by default] <command-line>:0:0: note: this is… >>> More
SEO: Nested List vs List, Split Over Divs vs Definition List

as seen on Pro Webmasters - Search for 'Pro Webmasters'
From an SEO perspective which, if any, is better: Option 1: Nested lists with h2 tags <ul id="mainpoints"> <li><h2>Powerful Analysis</h2> <ul> <li>Charting and indicators</li> <li>Daily trading signals</li> … >>> More
ASA hairpining: I basicaly want to allow 2 spokes to be able to communicate with each other.

as seen on Server Fault - Search for 'Server Fault'
ASA Spoke to Spoke Communication I have been looking at spke to spoke comms or "hairpining" for months and have posted on numerouse forums but to no avail. I have a Hub and spoke network where the HUB is an ASA Firewall version 8.2 * I basicaly want to allow 2 spokes to be able to communicate with… >>> More
How to remove a package entirely?

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
Hi I'm quite new to Linux, but before using it I was hearing that Windows programs, after uninstallation, leaves a lot of remains on the hard disc, and Linux removes all. I'm using Ubuntu 10.04. To uninstall packages I'm using sudo apt-get autoremove application_name or sudo aptitude purge application_name… >>> More
Update a list from another list

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a list of users in local store that I need to update from a remote list of users every once in a while. Basically: If a remote user already exists locally, update its fields. If a remote user doesn't already exist locally, add the user. If a local user doesn't appear in the remote list, deactivate… >>> More

Related posts about dataframes

Why can't I rename a data frame column inside a list?

as seen on Stack Overflow - Search for 'Stack Overflow'
I would like to rename some columns from CPU_Usage to the process name before I merge the dataframes in order to make it more legible. names(byProcess[[1]]) # [1] "Time" "CPU_Usage" names(byProcess[1]) # [1] "CcmExec_3344" names(byProcess[[1]][2]) <- names(byProcess[1]) names(byProcess[[1]][2]) #… >>> More
Python Pandas operate on row

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi my dataframe look like: Store,Dept,Date,Sales 1,1,2010-02-05,245 1,1,2010-02-12,449 1,1,2010-02-19,455 1,1,2010-02-26,154 1,1,2010-03-05,29 1,1,2010-03-12,239 1,1,2010-03-19,264 Simply, I need to add another column called '_id' as concatenation of Store, Dept, Date like "1_1_2010-02-05", I assume… >>> More
change data frame columns to rows

as seen on Stack Overflow - Search for 'Stack Overflow'
Sorry if this is obvious: I found a lot of questions similar to mine but I can't figure it out for my own data. I have a data frame that looks like this: A <- c(1,6) B <- c(2,7) C <- c(3,8) D <- c(4,9) E <- c(5,0) df <- data.frame(A,B,C,D,E) df A B C D E 1 1 2 3 4 5 2 6 7 8 9… >>> More
How to Import a CSV file containing multiple sections into R?

as seen on Stack Overflow - Search for 'Stack Overflow'
I want to import the contents of a csv file into R, the csv file contains multiple sections of data vertically, seperated by blank lines and asterisks. For example ******************************************************** * SAMPLE DATA ****************************************** ******************************************************** Name… >>> More
add several variables to dataframe, based on vector

as seen on Stack Overflow - Search for 'Stack Overflow'
I am sure this is easy - but I can't figure it out right now. Basically: I have a long vector of variables: names <- c("first","second", "third") I have some data, and I now need to add the variables. I could do: data$first <- NA But since I have a long list, and I would like an automated… >>> More