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lily li

2017-May-09 14:44 UTC

[R] About calculating average values from several matrices

I'm trying to get a new dataframe or whatever to call, which has the same
structure with each file as listed above. For each cell in the new
dataframe or the new file, it is the average value from former dataframes
at the same location. Thanks.

On Tue, May 9, 2017 at 8:41 AM, Doran, Harold <HDoran at air.org> wrote:
> Are you trying to take the mean over all cells, or over rows/columns
> within each dataframe. Also, are these different dataframes stored within a
> list or are they standalone?
>
>
>
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of lily li
> Sent: Tuesday, May 09, 2017 10:39 AM
> To: R mailing list <r-help at r-project.org>
> Subject: [R] About calculating average values from several matrices
>
> Hi R users,
>
> I have a question about manipulating the data.
> For example, there are several such data frames or matrices, and I want to
> calculate the average value from all the data frames or matrices. How to do
> it? Also, should I convert them to data frame or matrix first? Right now,
> when I use typeof() function, each one is a list.
>
> file1
>             jan   feb   mar   apr   may   jun   jul   aug   sep   oct   nov
>
> app1   1.1   1.2    0.8    0.9   1.3    1.5   2.2   3.2   3.0    1.2   1.1
> app2   3.1   3.2    2.8    2.5   2.3    2.5   3.2   3.0   2.9    1.8   1.8
> app3   5.1   5.2    3.8    4.9   5.3    5.5   5.2   4.2   5.0    4.2   4.1
>
> file2
>             jan   feb   mar   apr   may   jun   jul   aug   sep   oct   nov
>
> app1   1.9   1.5    0.5    0.9   1.2    1.8   2.5   3.7   3.2    1.5   1.6
> app2   3.5   3.7    2.3    2.2   2.5    2.0   3.6   3.2   2.8    1.2   1.4
> app3   5.5   5.0    3.5    4.4   5.4    5.6   5.3   4.4   5.2    4.3   4.2
>
> file3 has the similar structure and values...
>
> There are eight such files, and when I use the function mean(file1, file2,
> file3, ..., file8), it returns the error below. Thanks for your help.
>
> Warning message:
> In mean.default(file1, file2, file3, file4, file5, file6, file7,  :
>   argument is not numeric or logical: returning NA
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.
>
	[[alternative HTML version deleted]]

Doran, Harold

2017-May-09 14:50 UTC

head link

[R] About calculating average values from several matrices

It?s not clear to me what your actual structure is. Can you provide str(object)?
Assuming it is a list, and you want the mean over all cells or columns, you
might want like this:

myData <- vector("list", 3)

for(i in 1:3){
                myData[[i]] <- matrix(rnorm(100), 10, 10)
                }

### mean over all cells
sapply(myData, function(x) mean(x))

### mean over all columns
sapply(myData, function(x) colMeans(x))





From: lily li [mailto:chocold12 at gmail.com]
Sent: Tuesday, May 09, 2017 10:44 AM
To: Doran, Harold <HDoran at air.org>
Cc: R mailing list <r-help at r-project.org>
Subject: Re: [R] About calculating average values from several matrices

I'm trying to get a new dataframe or whatever to call, which has the same
structure with each file as listed above. For each cell in the new dataframe or
the new file, it is the average value from former dataframes at the same
location. Thanks.

On Tue, May 9, 2017 at 8:41 AM, Doran, Harold <HDoran at
air.org<mailto:HDoran at air.org>> wrote:
Are you trying to take the mean over all cells, or over rows/columns within each
dataframe. Also, are these different dataframes stored within a list or are they
standalone?



-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org<mailto:r-help-bounces at
r-project.org>] On Behalf Of lily li
Sent: Tuesday, May 09, 2017 10:39 AM
To: R mailing list <r-help at r-project.org<mailto:r-help at
r-project.org>>
Subject: [R] About calculating average values from several matrices

Hi R users,

I have a question about manipulating the data.
For example, there are several such data frames or matrices, and I want to
calculate the average value from all the data frames or matrices. How to do it?
Also, should I convert them to data frame or matrix first? Right now, when I use
typeof() function, each one is a list.

file1
            jan   feb   mar   apr   may   jun   jul   aug   sep   oct   nov

app1   1.1   1.2    0.8    0.9   1.3    1.5   2.2   3.2   3.0    1.2   1.1
app2   3.1   3.2    2.8    2.5   2.3    2.5   3.2   3.0   2.9    1.8   1.8
app3   5.1   5.2    3.8    4.9   5.3    5.5   5.2   4.2   5.0    4.2   4.1

file2
            jan   feb   mar   apr   may   jun   jul   aug   sep   oct   nov

app1   1.9   1.5    0.5    0.9   1.2    1.8   2.5   3.7   3.2    1.5   1.6
app2   3.5   3.7    2.3    2.2   2.5    2.0   3.6   3.2   2.8    1.2   1.4
app3   5.5   5.0    3.5    4.4   5.4    5.6   5.3   4.4   5.2    4.3   4.2

file3 has the similar structure and values...

There are eight such files, and when I use the function mean(file1, file2,
file3, ..., file8), it returns the error below. Thanks for your help.

Warning message:
In mean.default(file1, file2, file3, file4, file5, file6, file7,  :
  argument is not numeric or logical: returning NA
        [[alternative HTML version deleted]]

______________________________________________
R-help at r-project.org<mailto:R-help at r-project.org> mailing list -- To
UNSUBSCRIBE and more, see 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.


	[[alternative HTML version deleted]]

lily li

2017-May-09 14:52 UTC

head link

[R] About calculating average values from several matrices

I meant for each cell, it takes the average from other dataframes at the
same cell. I don't know how to deal with row names and col names though, so
it has the error message.

On Tue, May 9, 2017 at 8:50 AM, Doran, Harold <HDoran at air.org> wrote:
> It?s not clear to me what your actual structure is. Can you provide
> str(object)? Assuming it is a list, and you want the mean over all cells or
> columns, you might want like this:
>
>
>
> myData <- vector("list", 3)
>
>
>
> for(i in 1:3){
>
>                 myData[[i]] <- matrix(rnorm(100), 10, 10)
>
>                 }
>
>
>
> ### mean over all cells
>
> sapply(myData, function(x) mean(x))
>
>
>
> ### mean over all columns
>
> sapply(myData, function(x) colMeans(x))
>
>
>
>
>
>
>
>
>
>
>
> *From:* lily li [mailto:chocold12 at gmail.com]
> *Sent:* Tuesday, May 09, 2017 10:44 AM
> *To:* Doran, Harold <HDoran at air.org>
> *Cc:* R mailing list <r-help at r-project.org>
> *Subject:* Re: [R] About calculating average values from several matrices
>
>
>
> I'm trying to get a new dataframe or whatever to call, which has the
same
> structure with each file as listed above. For each cell in the new
> dataframe or the new file, it is the average value from former dataframes
> at the same location. Thanks.
>
>
>
> On Tue, May 9, 2017 at 8:41 AM, Doran, Harold <HDoran at air.org>
wrote:
>
> Are you trying to take the mean over all cells, or over rows/columns
> within each dataframe. Also, are these different dataframes stored within a
> list or are they standalone?
>
>
>
>
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of lily li
> Sent: Tuesday, May 09, 2017 10:39 AM
> To: R mailing list <r-help at r-project.org>
> Subject: [R] About calculating average values from several matrices
>
> Hi R users,
>
> I have a question about manipulating the data.
> For example, there are several such data frames or matrices, and I want to
> calculate the average value from all the data frames or matrices. How to do
> it? Also, should I convert them to data frame or matrix first? Right now,
> when I use typeof() function, each one is a list.
>
> file1
>             jan   feb   mar   apr   may   jun   jul   aug   sep   oct   nov
>
> app1   1.1   1.2    0.8    0.9   1.3    1.5   2.2   3.2   3.0    1.2   1.1
> app2   3.1   3.2    2.8    2.5   2.3    2.5   3.2   3.0   2.9    1.8   1.8
> app3   5.1   5.2    3.8    4.9   5.3    5.5   5.2   4.2   5.0    4.2   4.1
>
> file2
>             jan   feb   mar   apr   may   jun   jul   aug   sep   oct   nov
>
> app1   1.9   1.5    0.5    0.9   1.2    1.8   2.5   3.7   3.2    1.5   1.6
> app2   3.5   3.7    2.3    2.2   2.5    2.0   3.6   3.2   2.8    1.2   1.4
> app3   5.5   5.0    3.5    4.4   5.4    5.6   5.3   4.4   5.2    4.3   4.2
>
> file3 has the similar structure and values...
>
> There are eight such files, and when I use the function mean(file1, file2,
> file3, ..., file8), it returns the error below. Thanks for your help.
>
> Warning message:
> In mean.default(file1, file2, file3, file4, file5, file6, file7,  :
>   argument is not numeric or logical: returning NA
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.
>
>
>
	[[alternative HTML version deleted]]

R help - May 2017 - About calculating average values from several matrices

[R] About calculating average values from several matrices

[R] About calculating average values from several matrices

[R] About calculating average values from several matrices