[R] Varying name of output tables from looped process of list of spdf objects

[Sarah Goslee]

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.larrosa10 at 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