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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