Thank you Tal, useful link.
Best,
Aurelie

On 2012-03-09, at 11:53 AM, Tal Galili wrote:

> Hi Aurelie,
> Please give this a look:
> http://www.nealgroothuis.name/introduction-to-data-types-and-objects-in-r/ 
> 
> And see if this resolves most, or all, of your questions...
> 
> 
> ----------------Contact Details:-------------------------------------------------------
> Contact me: Tal.Galili@gmail.com |  972-52-7275845
> Read me: www.talgalili.com (Hebrew) | www.biostatistics.co.il (Hebrew) | www.r-statistics.com (English)
> ----------------------------------------------------------------------------------------------
> 
> 
> 
> 
> On Fri, Mar 9, 2012 at 5:48 PM, Aurelie Cosandey Godin <GodinA@dal.ca> wrote:
> Dear all,
> 
> I'm trying to create a list of point patterns ppp.object {spatstat} in a loop.
> My dataset looks like this:
> 
>    > names(OT1);head(OT1);dim(OT1)
>    [1] "EID"       "latitude"  "longitude" "month"     "year"      "CPUE"      "TSUM"
>    [8] "fTSUM"
>                    EID latitude longitude month year CPUE TSUM fTSUM
>    1   167-1-1996-1135 67.70000 -61.81667     9 1996    0    0     F
>    2  167-10-1996-1135 67.71667 -59.18333     9 1996    0    0     F
>    3 167-100-1996-1135 67.86667 -59.43333    10 1996    0    0     F
>    4 167-101-1996-1135 67.95000 -59.58333    10 1996    0    0     F
>    5 167-102-1996-1135 68.10000 -59.76667    10 1996    0    0     F
>    6 167-103-1996-1135 67.81667 -59.38333    10 1996    0    0     F
>    [1] 2707    8
> 
> What I would like to do is to select data for each of my month and create a ppp.object.
> 
>    > sort(unique(OT1$month))
>    [1]  7  8  9 10 11 12
> 
> The following loop works and I can see each of my figures:
> 
>    for(i in sort(unique(OT1$month))){
>      a<-OT1[OT1$month==i,]
>      b<-ppp(a$longitude,a$latitude,marks=a$fTSUM,window=newW)
>      plot(b,main=i)
>    }
> 
> How can I access each of my ppp.objects? I've tried adding a list() in the loop command such that I can access the data but without any success... Any help would be much appreciated!
> 
> Thank you!
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