apply() is also a (disguised) loop, though.
I think you will find that indexing via rowSums is a lot faster:
## The example
set.seed(111) ## for reproducibility
a<-matrix(sample(1:20,350,TRUE),ncol=10) ## 35 rows
## A one-liner
a[rowSums(a != 1) == 10, ] ## 20 rows
Bert Gunter
"The trouble w
Okay, if I understand this, you want to remove all rows that have, for
example, a 1 in any of ten columns:
a<-matrix(sample(1:20,350,TRUE),ncol=10)
# check it out
a
# first do it with a loop
b<-a
for(i in 1:ncol(b)) b<-b[b[,i]!=1,]
b
# now get tricky and do it in one operation
no1s<-apply(a,1,func
Martin,
Thank you very much for posting a great reply.
Cheers,
Chris Bartlett
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide com
Let's not cross-post! I'll pick up only one point of general relevance on
this list (R-help).
On Tue, 5 Aug 2008, Matt Oliver wrote:
you can try
memory.limit(size=4000)
only if you have 4GB of memory on the system
This is not guaranteed to solve your problem though
Assuming this is Windo
Per
> conto di Dylan Beaudette Inviato: martedì 5 agosto 2008 14.25
> A: r-help@r-project.org
> Oggetto: Re: [R] LIDAR Problem in R (THANKS for HELP)
>
> On Tuesday 05 August 2008, Alessandro wrote:
> > Hi All,
> >
> >
> >
> > I am a PhD student in forest
On Tuesday 05 August 2008, Alessandro wrote:
> Hi All,
>
>
>
> I am a PhD student in forestry science and I am working with LiDAR data set
> (huge data set). I am a brand-new in R and geostatistic (SORRY, my
> background its in forestry) but I wish improve my skill for improve
> myself. I wish to
you can try
memory.limit(size=4000)
only if you have 4GB of memory on the system
This is not guaranteed to solve your problem though
With big datasets like lidar, you are much better off getting access to a
64bit system with a ton of RAM (>64GB).
Cheers
Matt
On Tue, Aug 5, 2008 at 1:47 PM,
ailto:[EMAIL PROTECTED]
Inviato: martedì 5 agosto 2008 13.24
A: Alessandro
Oggetto: Re: R: [R-sig-Geo] R: LIDAR Problem in R (THANKS for HELP)
If an extra GB of memory will solve the problem, you might try doing a google
search on '3 GB Switch Windows Vista' and see if it's possib
-help@r-project.org; [EMAIL PROTECTED]
Oggetto: Re: [R-sig-Geo] LIDAR Problem in R (THANKS for HELP)
you can try
memory.limit(size=4000)
only if you have 4GB of memory on the system
This is not guaranteed to solve your problem though
With big datasets like lidar, you are much better off
Hi All,
I am a PhD student in forestry science and I am working with LiDAR data set
(huge data set). I am a brand-new in R and geostatistic (SORRY, my
background its in forestry) but I wish improve my skill for improve myself.
I wish to develop a methodology to processing a large data-set o
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