R help - Jun 2018 - Efficient manipulation with list object

Hi,

I have a list of length 10,000, and each element of that list is a matrix
with 3 columns and 2,000 rows.

Now when I tried to make a Matrix object with that list using
Reduce('rbind', list), my code is taking a considerable amount of time.

Is there any way to implement same above task in more efficient way?

Thanks,

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Try this. Suppose your list of matrices is in the list locL.

nc <- 3

locL2 <- list()
for ( i in 1:length(locL )
  locL2[[i]] <- as.numeric(t(locL[[i]]))

bigMat <- matrix(unlist(locL3), ncol=nc, byrow=TRUE)

HTH,
Eric


On Sun, Jun 10, 2018 at 6:33 PM, Christofer Bogaso <
bogaso.christofer at gmail.com> wrote:
> Hi,
>
> I have a list of length 10,000, and each element of that list is a matrix
> with 3 columns and 2,000 rows.
>
> Now when I tried to make a Matrix object with that list using
> Reduce('rbind', list), my code is taking a considerable amount of
time.
>
> Is there any way to implement same above task in more efficient way?
>
> Thanks,
>
>         [[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]]

Sorry typos

Try this. Suppose your list of matrices is in the list locL.

nc <- 3

locL2 <- list()
for ( i in 1:length(locL) )
  locL2[[i]] <- as.numeric( t( locL[[i]] ) )

bigMat <- matrix(unlist(locL2), ncol=nc, byrow=TRUE)

HTH,
Eric


On Sun, Jun 10, 2018 at 7:10 PM, Eric Berger <ericjberger at gmail.com>
wrote:
> Try this. Suppose your list of matrices is in the list locL.
>
> nc <- 3
>
> locL2 <- list()
> for ( i in 1:length(locL )
>   locL2[[i]] <- as.numeric(t(locL[[i]]))
>
> bigMat <- matrix(unlist(locL3), ncol=nc, byrow=TRUE)
>
> HTH,
> Eric
>
>
> On Sun, Jun 10, 2018 at 6:33 PM, Christofer Bogaso <
> bogaso.christofer at gmail.com> wrote:
>
>> Hi,
>>
>> I have a list of length 10,000, and each element of that list is a
matrix
>> with 3 columns and 2,000 rows.
>>
>> Now when I tried to make a Matrix object with that list using
>> Reduce('rbind', list), my code is taking a considerable amount
of time.
>>
>> Is there any way to implement same above task in more efficient way?
>>
>> Thanks,
>>
>>         [[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/posti
>> ng-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>
	[[alternative HTML version deleted]]