R help - Oct 2017 - Iterate in a Spatial Polygon Dataframe in R?

Hi all,

?I'm trying to iterate in a SpatialPolygonDataFrame thatcontains 110
features. I tried to use the following code?
iterate.spdf =function(x){ for (i in 1:nrow(x)){ p = x[i, ]} return(p)}
but with no success as it returns with aSpatialPolygonDataFrame that contains
onlyone feature. The code seems to overwrite the polygons to end up with only
onefeature.
?Any suggestions?Ashraf, cheers


	[[alternative HTML version deleted]]

Ashraf,

What do you want your function to do?
Currently you are overwriting p each time you go through your for-loop, and you
finally return p = x[nrow(x), ]

It is similar to

y = 101:200
for (i in 1:100) {
  x = y[i]
}
x


Best,
Jon


--
Jon Olav Sk?ien
European Commission
Joint Research Centre ? JRC.E.1
Disaster Risk Management Unit
Building 26b 1/144 | Via E.Fermi 2749, I-21027 Ispra (VA) Italy, TP 267
Disclaimer: Views expressed in this email are those of the individual and do not
necessarily represent official views of the European Commission.


________________________________________
From: R-help [r-help-bounces at r-project.org] on behalf of Ashraf Afana via
R-help [r-help at r-project.org]
Sent: 11 October 2017 13:55
To: r-help at r-project.org
Subject: [R] Iterate in a Spatial Polygon Dataframe in R?

Hi all,

 I'm trying to iterate in a SpatialPolygonDataFrame thatcontains 110
features. I tried to use the following code
iterate.spdf =function(x){ for (i in 1:nrow(x)){ p = x[i, ]} return(p)}
but with no success as it returns with aSpatialPolygonDataFrame that contains
onlyone feature. The code seems to overwrite the polygons to end up with only
onefeature.
 Any suggestions?Ashraf, cheers


        [[alternative HTML version deleted]]

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