Dear Lily,
Harold is telling you to type "?round" at the R command prompt to pull
up the "round" help page.
>?round
>help("round")
AFAIK, the above two commands are equivalent, in general.
Best, Bill.
W. Michels, Ph.D.
On Tue, May 9, 2017 at 8:11 AM, Doran, Harold <hdo...@air.org> wrote:
> ?round
>
>
> From: lily li [mailto:chocol...@gmail.com]
> Sent: Tuesday, May 09, 2017 11:10 AM
> To: Charles Determan <cdeterma...@gmail.com>
> Cc: Doran, Harold <hdo...@air.org>; R mailing list <r-help@r-project.org>
> Subject: Re: [R] About calculating average values from several matrices
>
> Thanks very much, it works. But how to round the values to have only 1
> decimal digit or 2 decimal digits? I think by dividing, the values are double
> type now. Thanks again.
>
>
> On Tue, May 9, 2017 at 9:04 AM, Charles Determan
> <cdeterma...@gmail.com<mailto:cdeterma...@gmail.com>> wrote:
> If you want the mean of each element across you list of matrices the
> following should provide what you are looking for where Reduce sums all your
> matrix elements across matrices and the simply divided my the number of
> matrices for the element-wise mean.
>
> Reduce(`+`, mylist)/length(mylist)
> Regards,
> Charles
>
> On Tue, May 9, 2017 at 9:52 AM, lily li
> <chocol...@gmail.com<mailto:chocol...@gmail.com>> wrote:
> 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
> <hdo...@air.org<mailto:hdo...@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:chocol...@gmail.com<mailto:chocol...@gmail.com>]
>> *Sent:* Tuesday, May 09, 2017 10:44 AM
>> *To:* Doran, Harold <hdo...@air.org<mailto:hdo...@air.org>>
>> *Cc:* R mailing list <r-help@r-project.org<mailto:r-help@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
>> <hdo...@air.org<mailto:hdo...@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-boun...@r-project.org<mailto:r-help-boun...@r-project.org>]
>> On Behalf Of lily li
>> Sent: Tuesday, May 09, 2017 10:39 AM
>> To: R mailing list <r-help@r-project.org<mailto:r-help@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]]
>>
>> ______________________________________________
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>> posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>>
>>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org<mailto:R-help@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@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.
______________________________________________
R-help@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
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