Thank you, Martin.
Yes, on my computer (48Gb memory) it also gives a message "caught
segfault" as you got. So it is because the matrix size is too large.
I apologize for the offence I've caused.
2011/8/4 Martin Maechler :
>>>>>> C6H5NO2
>>>>&g
ix_0.999375-50 lattice_0.19-30
>
> loaded via a namespace (and not attached):
> [1] grid_2.14.0 tools_2.14.0
>
> Cheers,
>
> Josh
>
> On Wed, Aug 3, 2011 at 4:26 PM, C6H5NO2 wrote:
>> Hello R users,
>>
>> I am trying to give the QR decomposition for a large
Hello R users,
I am trying to give the QR decomposition for a large sparse matrix in
the format of dgCMatrix. When I run qr function for this matrix, the R
session simply stops and exits to the shell.
The matrix is of size 108595x108595, and it has 4866885 non-zeros. I
did the experiment on window
Hi R users,
I want to know whether there is a fast method to compute the nonzeroes for
each column of dgCMatrix.
For summation or average I can use colSums or colMeans. To count the
non-zeroes I write a function
colCounts <- function(Mat) {
M1 <- apply(Mat, MARGIN=2, FUN=nnzero)
}
But it se
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