Ah, but they don't look exactly the same. Look closer at the first
line of the print() output.
You might also look at
class(fnp)
class(a_10)
for a clue.
What happens if you run:
distance.matrix<- gDistance(fnp[[1]], spgeom2= NULL, byid=T)
Sarah
On Mon, Jul 27, 2015 at 12:33 PM, SisoL
<cecilia.larros...@imperial.ac.uk> wrote:
> Hi Peter,
>
> Thank you for your reply. The method for looping seems to work, but
> gDistance will not recognise the input. I am puzzled because when I
> print(fnp), and print (a_10) they look exactly the same, but when I try to
> run gDistance{rgeos} with a_10 it works, but with fnp it throws an error.
> Please see below. Any other suggestions?
>
>>afiles <- ls(pattern= "a_") #OK
>>print(afiles)
> [1] "a_1" "a_10"
>
>>fnp<- mget(afiles[ifile]) #OK
>
>> print(fnp)
> $a_10
> class : SpatialPolygonsDataFrame
> features : 5
> extent : 825796.9, 831270.1, 815666.9, 816562.5 (xmin, xmax, ymin,
> ymax)
> coord. ref. : +proj=aea +lat_1=-5 +lat_2=-42 +lat_0=-32 +lon_0=-60 +x_0=0
> +y_0=0 +ellps=aust_SA +units=m +no_defs
> variables : 5
> names : ID, GRIDCODE, Shape_Leng, Shape_Area, Count
> min values : 1, 1, 94.2722341164, 6.47354525991, 1
> max values : 5, 1, 2305.45647624, 92111.8528756, 1
>
>> print(a_10)
> class : SpatialPolygonsDataFrame
> features : 5
> extent : 825796.9, 831270.1, 815666.9, 816562.5 (xmin, xmax, ymin,
> ymax)
> coord. ref. : +proj=aea +lat_1=-5 +lat_2=-42 +lat_0=-32 +lon_0=-60 +x_0=0
> +y_0=0 +ellps=aust_SA +units=m +no_defs
> variables : 5
> names : ID, GRIDCODE, Shape_Leng, Shape_Area, Count
> min values : 1, 1, 94.2722341164, 6.47354525991, 1
> max values : 5, 1, 2305.45647624, 92111.8528756, 1
>
>>distance.matrix<- gDistance(fnp, spgeom2= NULL, byid=T)
> Error in (function (classes, fdef, mtable) :
> unable to find an inherited method for function ‘is.projected’ for
> signature ‘"list"’
>
--
Sarah Goslee
http://www.functionaldiversity.org
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