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

[SisoL]

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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