[R] saving large matrices with decimal numbers

[Petr PIKAL]

Hi

image<-matrix(0.1, 768,1024)
> image[1:10, 1:10]
      [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
 [1,]  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1   0.1
 [2,]  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1   0.1
 [3,]  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1   0.1
 [4,]  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1   0.1
 [5,]  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1   0.1
 [6,]  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1   0.1
 [7,]  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1   0.1
 [8,]  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1   0.1
 [9,]  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1   0.1
[10,]  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1   0.1
 write.table(image, "temp.txt",col.names=F, row.names=F)

saved without problems to working directory. So I suspect that in your 
case it is a problem in specifying the output file. Couldn't  be the 
output file opened in some other programme?

regards
Petr

r-help-bounces at r-project.org napsal dne 04.09.2009 12:04:42:

> 
> > Please tell us what you did exactly when you got the empty file:
> > PLEASE do read the posting guide 
http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> 
> well, that's exactly the point, I didn't do anything fancy or special, 
> just save the matrix I gave you before (1024 X 768) either in format 
> txt.
> 
> write.table(image, "~/mydata/blablabla/data.txt", col.names=F, 
row.names=F)
> 
> or csv:
> 
> write.csv (image, "~/mydata/blablabla/data.csv")
> 
> 
> both cases the output is an empty file. Do you know what can be the 
problem?
> 
> Thanks a lot,
> 
> Moreno
> 
>   write.csv (image, 
> "/afs/inf.ed.ac.uk/user/s07/s0788806/R/r_data/ProdEyeTrack/DataFrame/
> Clustered/Clut/Cluster1/Cl1Verb-tr.csv.1")
> 
> 
> 
> Quoting Uwe Ligges <ligges at statistik.tu-dortmund.de>:
> 
> > Moreno Ignazio Coco wrote:
> >> Hi everybody,
> >>
> >> I am struggling to save txt. or csv. large sparse matrices (1024 X 
> >> 768 image size), initialized at 0.1.
> >>
> >> image1[0:10,0:10]
> >>      [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
> >> [1,]  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1   0.1
> >> [2,]  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1   0.1
> >> [3,]  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1   0.1
> >> [4,]  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1   0.1
> >> [5,]  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1   0.1
> >> [6,]  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1   0.1
> >> [7,]  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1   0.1
> >> [8,]  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1   0.1
> >> [9,]  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1   0.1
> >> [10,]  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1  0.1   0.1
> >>
> >> with small distributions located at different points of matrix.
> >> If I try the same matrix but initialized at 0, it can save it.
> >>
> >> It seems that R manages to save up around 800 X 600 decimal 
> >> matrices but for bigger sizes the output is an empty file. Does 
> >> anyone know whether there is a limit in saving such matrices and 
> >> how can I work around this problem?
> >
> > Please tell us what you did exactly when you got the empty file:
> > PLEASE do read the posting guide 
http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
> > Best wishes,
> > Uwe Ligges
> >
> >
> >
> >>
> >> Thanks a lot,
> >>
> >> Regards,
> >>
> >> Moreno
> >>
> >>
> >>
> 
> 
> 
> -- 
> The University of Edinburgh is a charitable body, registered in
> Scotland, with registration number SC005336.
> 
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> PLEASE do read the posting guide 
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> and provide commented, minimal, self-contained, reproducible code.