[R-sig-Geo] Manipulate extract output

jm3389 jm3389 at columbia.edu
Mon Apr 25 01:33:32 CEST 2011 

My bad forgot to add utils::

it's working ! Thanks a lot Gustavo

>utils::stack(X)
             values       ind
1     0.0850569680   1
2     0.1152195707   1
3     0.0702793971   1
4     0.0702793971   1
5     0.1055974513   1
6     0.1036369652   1
7     0.0935368910   1
8     0.0935368910   1
9     0.0967371687   1
10    0.1253680587   1
11    0.1569617689   1
12    0.0930611789   1
13    0.0935368910   1
14    0.0967371687   1
15    0.0930611789   1
16    0.0930611789   1
17    0.0966949463   1
18    0.0260952916   2
19    0.0260952916   2
20    0.0299622640   2
21   -0.0005707200   2
22    0.0215936881   2

---------------------------------------------------------
Joseph Muhlhausen
Project development researcher | CIESIN
61 Route 9W, PO Box 1000
Palisades, NY 10964 USA | 845-365-8935




On Sun, Apr 24, 2011 at 5:54 PM, Gustavo Carvalho [via R-sig-geo] <
ml-node+6301600-211949547-332023 at n2.nabble.com> wrote:

> utils::stack(X)
>
> On Sun, Apr 24, 2011 at 6:21 PM, jm3389 <[hidden email]<http://user/SendEmail.jtp?type=node&node=6301600&i=0&by-user=t>>
> wrote:
>
> > Thanks for the quick response Gustavo.
> >
> > after names(X) <- 1:length(X)
> >
> > I get this:
> >
> >>X
> > $`1`
> >  [1] 0.08505697 0.11521957 0.07027940 0.07027940 0.10559745 0.10363697
> > 0.09353689
> >  [8] 0.09353689 0.09673717 0.12536806 0.15696177 0.09306118 0.09353689
> > 0.09673717
> > [15] 0.09306118 0.09306118 0.09669495
> >
> > $`2`
> >  [1]  0.02609529  0.02609529  0.02996226 -0.00057072  0.02159369
>  0.02159369
> >  [7]  0.04489277  0.02804214  0.02835380  0.06462935  0.06462935
>  0.02266412
> > [13]  0.03684234  0.02083779  0.07917891  0.05502048  0.03577228
> >
> > $`3`
> >  [1] 0.08705948 0.08705948 0.08622552 0.05902963 0.05902963 0.03294581
> > 0.08919024
> >  [8] 0.10308155 0.10308155 0.04357137 0.06129387 0.18882106 0.15271443
> > 0.15271443
> > [15] 0.07749587 0.23532785 0.23532785
> >
> > And I am able to call individual vectors using this command X$'1', so
> that's
> > an improvement.
> >
> > Yet the stack(X) still doesn't work
> >
> >> stack(X)
> > Error in .local(x, ...) :
> >  Arguments should be Raster* objects or filenames
> >
> >
> > On Sun, Apr 24, 2011 at 11:15 AM, Gustavo Carvalho [via R-sig-geo] <
> > [hidden email]<http://user/SendEmail.jtp?type=node&node=6301600&i=1&by-user=t>>
> wrote:
> >
> >> Dear Joseph,
> >>
> >> Could you please try this?
> >>
> >> names(X) <- 1:length(X)
> >> stack(X)
> >>
> >> Gustavo.
> >>
> >> On Sun, Apr 24, 2011 at 11:55 AM, jm3389 <[hidden email]<
> http://user/SendEmail.jtp?type=node&node=6301092&i=0&by-user=t>>
> >> wrote:
> >>
> >> > Dear All,
> >> >
> >> > I have been struggling to extract individual pixel values from within
> a
> >> set
> >> > of polygons.
> >> >
> >> > Mbola.shp <-
> readOGR(dsn="C:/Users/JOX201S/Desktop/Dropbox/LDSF/Mbola",
> >> > "MBSubplot1LULC")
> >> > SMA <-
> >> raster("C:/Users/JOX201S/Desktop/Dropbox/LDSF/Mbola/SMA-clipped.img")
> >> >
> >> > X <- extract(SMA, Mbola.shp)
> >> >
> >> > then when I display X I obtain a list:
> >> >
> >> >>X
> >> > [[1]]
> >> >  [1] 0.08505697 0.11521957 0.07027940 0.07027940 0.10559745 0.10363697
>
> >> > 0.09353689
> >> >  [8] 0.09353689 0.09673717 0.12536806 0.15696177 0.09306118
> 0.09353689
> >> > 0.09673717
> >> > [15] 0.09306118 0.09306118 0.09669495
> >> >
> >> > [[2]]
> >> >  [1]  0.02609529  0.02609529  0.02996226 -0.00057072  0.02159369
> >>  0.02159369
> >> >  [7]  0.04489277  0.02804214  0.02835380  0.06462935  0.06462935
> >>  0.02266412
> >> > [13]  0.03684234  0.02083779  0.07917891  0.05502048  0.03577228
> >> >
> >> > [[3]]
> >> >  [1] 0.08705948 0.08705948 0.08622552 0.05902963 0.05902963 0.03294581
>
> >> > 0.08919024
> >> >  [8] 0.10308155 0.10308155 0.04357137 0.06129387 0.18882106 0.15271443
>
> >> > 0.15271443
> >> > [15] 0.07749587 0.23532785 0.23532785
> >> >
> >> > [[4]]
> >> >  [1] 0.09554891 0.09314694 0.13511878 0.12017184 0.12056647 0.10497463
>
> >> > 0.19552167
> >> >  [8] 0.19496135 0.10160323 0.09736327 0.12032449 0.18401594
> 0.13698930
> >> > 0.09173016
> >> > [15] 0.11627619 0.13992140
> >> >
> >> > [[5]]
> >> >  [1] 0.08130399 0.12848020 0.15129283 0.06018241 0.06018241 0.12764616
>
> >> > 0.15831620
> >> >  [8] 0.16025396 0.07245398 0.07245398 0.08861573 0.15831620
> 0.16025396
> >> > 0.07245398
> >> > [15] 0.08861573 0.10879661
> >> >
> >> > [[6]]
> >> >  [1] 0.01403566 0.05509807 0.06573696 0.07086041 0.05806389 0.08060271
>
> >> > 0.04586258
> >> >  [8] 0.04270630 0.07691538 0.06859619 0.08897498 0.06756449
> 0.04492125
> >> > 0.04651234
> >> > [15] 0.04652581 0.08224432 0.04266668 0.05377325
> >> >
> >> > [[7]]
> >> >  [1] 0.19860968 0.13489768 0.11530623 0.11530623 0.12832202 0.18902805
>
> >> > 0.09427368
> >> >  [8] 0.08301217 0.08301217 0.11991798 0.18725793 0.19014162
> 0.14259814
> >> > 0.14259814
> >> > [15] 0.08376002 0.18725793 0.14259814 0.14259814 0.08376002
> >> >
> >> > [[8]]
> >> >  [1]  0.06091007  0.06091007  0.05323072  0.03962127  0.04709431
> >>  0.04709431
> >> >  [7]  0.05578892  0.06078413  0.03223819  0.02318165  0.02318165
> >>  0.04193906
> >> > [13]  0.04568461 -0.01365644  0.01866432  0.01866432  0.04833658
> >>  0.04675072
> >> > [19]  0.04113418  0.04113418  0.03635887
> >> >
> >> >
> >> > I would like to reshape the list like that:
> >> >
> >> > Pixel value  | Polygon
> >> > 0.08505697     [[1]]
> >> > 0.11521957     [[1]]
> >> > 0.07027940     [[1]]
> >> > 0.07027940     [[1]]
> >> > 0.10559745     [[1]]
> >> > ...
> >> >
> >> > I have tried stack, and the reshape package but haven't been able to
> >> > manipulate the list.
> >> > I am sure it's a very simple function but I've been searching the web
> for
> >>
> >> > days now and nothing really works.
> >> >
> >> > Any suggestion?
> >> > Thanks
> >> > Joseph
> >> >
> >> >
> >> > --
> >> > View this message in context:
> >>
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