Hello,
No, flights[2] is *not* equal to flights$months. The former is a
data.frame with only one column, therefore it has a dimension attribute.
The latter is a column, a vector of the data.frame flights, it does not
have the attribute dim set.
The difference is very important, see what clas
Hi,
You might want to become familiar with the ?str and ?dim functions, which can
help you identify the structure of the objects that you are passing to
colMeans().
In the first case, flights[2] is a data frame with a single column, so will
have two dimensions with a row and column structure.
On 04/11/2020 8:26 a.m., Engin Yılmaz wrote:
Dear
I use *flights* database library(nycflights13)
The following code is working as
colMeans(flights[2])
* 6.54851*
but other code is not working as
colMeans(flights$month)
*Error in colMeans(flights$month) : *
* 'x' must be an array of at lea
Dear
I use *flights* database library(nycflights13)
The following code is working as
colMeans(flights[2])
* 6.54851*
but other code is not working as
colMeans(flights$month)
*Error in colMeans(flights$month) : *
* 'x' must be an array of at least two dimensions*
*flights[2]* is equal to th
24739 8.591345 13.773817 5.386458 2.847495
5.448138
# 9 10 11 12
#9.266519 7.63 15.249745 14.335008
Hope it helps.
A.K.
From: eliza botto
To: "smartpink...@yahoo.com"
Cc: "r-help@r-project.org"
$WW
#[1] 2.153747 2.130745 5.828026 12.909944
A.K.
From: eliza botto
To: "smartpink...@yahoo.com"
Cc: "r-help@r-project.org"
Sent: Sunday, December 23, 2012 9:10 PM
Subject: RE: [R] colmeans not working
Dear Arun,
on having a bir
tto
To: bbol...@gmail.com; r-h...@stat.math.ethz.ch
Cc:
Sent: Sunday, December 23, 2012 7:48 PM
Subject: Re: [R] colmeans not working
Dear Ben,Thanks for replying but its still not working.your code
was>lapply(res,colMeans)but i want to use "res1" instead of "res". when i
:40:15 -0800
> From: smartpink...@yahoo.com
> Subject: Re: [R] colmeans not working
> To: eliza_bo...@hotmail.com
> CC: r-help@r-project.org; bbol...@gmail.com
>
> Hi Eliza,
>
> I tried with the example you gave. Couldn't reproduce the error.
>
>
>
> Date: Sun, 23 Dec 2012 17:40:15 -0800
> From: smartpink...@yahoo.com
> Subject: Re: [R] colmeans not working
> To: eliza_bo...@hotmail.com
> CC: r-help@r-project.org; bbol...@gmail.com
>
> Hi Eliza,
>
> I tried with the example you gave. Couldn't reproduce
lapply(res,function(x) rowMeans(x[,-1]))
#$Sa
# 1 2 3 4 5 6 7 8 9 10 11 12
#NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN NaN
#
#$Ta
# 1 2 3
#2.40 2.40 2.33
A.K.
- Original Message -
From: eliza botto
To: "r-help@r-project.org&q
Dear Ben,Thanks for replying but its still not working.your code
was>lapply(res,colMeans)but i want to use "res1" instead of "res". when i did
use it, i got same error.eliza
> To: r-h...@stat.math.ethz.ch
> From: bbol...@gmail.com
> Date: Mon, 24 Dec 2012
eliza botto hotmail.com> writes:
> Dear useRs,You must all the planning for the christmas, but i am
> stucked in my office on the following issue i had a file containg
> information about station name, year, month, day, and discharge
> information. i opened it by using following command
> > dat
[text file is also attached in case you find the format of email difficult to
understand]
Dear useRs,You must all the planning for the christmas, but i am stucked in my
office on the following issue
i had a file containg information about station name, year, month, day, and
discharge informatio
On 09/28/2009 10:47 PM, Matteo Mattiuzzi wrote:
Hello,
I use the function rowMeans(x,na.rm=T). The result is the mean of valid
values in each row, with NA removed. A for me very important information
is, from how many valid "n" this mean has computed.
The thing is, that I apply this function on
Hello,
I use the function rowMeans(x,na.rm=T). The result is the mean of valid
values in each row, with NA removed. A for me very important information
is, from how many valid "n" this mean has computed.
The thing is, that I apply this function on many millions of rows, so
the time it takes is
summaryBy in the doBy package can do that. The builtin iris data
set has 4 numeric columns and one factor column:
> library(doBy)
> summaryBy(.~1, iris, fun = mean, keep = TRUE)
Sepal.Length Sepal.Width Petal.Length Petal.Width
1 5.843.0573333.7581.199333
On Thu, Mar 2
On Thu, Mar 27, 2008 at 3:05 PM, Dimitris Rizopoulos
<[EMAIL PROTECTED]> wrote:
> try this:
>
> dat <- data.frame(x = rnorm(10), y = rexp(10), z = letters[1:10])
> colMeans(data.matrix(dat[sapply(dat, is.numeric)]))
Alternatively
> sapply(dat, mean)
x y z
-0.5260131
try this:
dat <- data.frame(x = rnorm(10), y = rexp(10), z = letters[1:10])
colMeans(data.matrix(dat[sapply(dat, is.numeric)]))
I hope it helps.
Best,
Dimitris
Dimitris Rizopoulos
Biostatistical Centre
School of Public Health
Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuv
Hi all,
I would like to know if it is posible by, someway, to get colMeans from
a data.frame with numeric as well as character data, dispersed all over
the object. Note that I would like to get colMeans neglecting character
data.
I am really in need of some function proceeding in that way
Al
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