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

[Anthoni, Peter (IMK)]

Hi Cecilia,

print(fnp) and print(a_10) are not exactly the same

>> print(fnp)
> $a_10
> class       : SpatialPolygonsDataFrame 
vs.
>> print(a_10)
> class       : SpatialPolygonsDataFrame 


Looks like mget returns a list.

Can you try: 
fnp <- get(afiles[ifile])[1]
print(fnp)
#the $a_10 should be gone.

cheers
Peter




> On 27 Jul 2015, at 18:33, 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"’
> 
> 
> 
> 
> --
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