Mixing
How to select components in s4 class like components in ordinary lists?
in R it is possible to create a list
k <- list()
k[[1]] <- airquality
k[[2]] <- rock
k[[3]] <- AirPassengers
k[[4]] <- airmiles
k[[5]] <- trees
k[[6]] <- treering
and selecting it with
k[c(1:3,6)]
How it is possible to do same in S4 class?
for example I create the some data from dismo package:
library(dismo)
example(voronoi)
that performs following:
p <- matrix(c(17, 42, 85, 70, 19, 53, 26, 84, 84, 46, 48, 85, 4, 95, 48, 54, 66, 74, 50, 48,
28, 73, 38, 56, 43, 29, 63, 22, 46, 45, 7, 60, 46, 34, 14, 51, 70, 31, 39, 26), ncol=2)
v <- voronoi(p)
v
I want to select the coordinates of a polygon, it can be done with.
v@polygons[[1]]@Polygons[[1]]@coords.
My question is How to select for example 1 to 3rd and sixth component?
my idea to use
v@polygons[c(1:3,6)]@Polygons[[1]]@coords
does not work. R says:
Error: trying to get slot "Polygons" from an object of a basic class ("list") with no slots
r
edited Nov 20 '18 at 14:11
John Coleman
34.3k53272
asked Nov 20 '18 at 14:06
smurfit89smurfit89
82212
add a comment |
in R it is possible to create a list
k <- list()
k[[1]] <- airquality
k[[2]] <- rock
k[[3]] <- AirPassengers
k[[4]] <- airmiles
k[[5]] <- trees
k[[6]] <- treering
and selecting it with
k[c(1:3,6)]
How it is possible to do same in S4 class?
for example I create the some data from dismo package:
library(dismo)
example(voronoi)
that performs following:
p <- matrix(c(17, 42, 85, 70, 19, 53, 26, 84, 84, 46, 48, 85, 4, 95, 48, 54, 66, 74, 50, 48,
28, 73, 38, 56, 43, 29, 63, 22, 46, 45, 7, 60, 46, 34, 14, 51, 70, 31, 39, 26), ncol=2)
v <- voronoi(p)
v
I want to select the coordinates of a polygon, it can be done with.
v@polygons[[1]]@Polygons[[1]]@coords.
My question is How to select for example 1 to 3rd and sixth component?
my idea to use
v@polygons[c(1:3,6)]@Polygons[[1]]@coords
does not work. R says:
Error: trying to get slot "Polygons" from an object of a basic class ("list") with no slots
r
edited Nov 20 '18 at 14:11
John Coleman
34.3k53272
asked Nov 20 '18 at 14:06
smurfit89smurfit89
82212
add a comment |
in R it is possible to create a list
k <- list()
k[[1]] <- airquality
k[[2]] <- rock
k[[3]] <- AirPassengers
k[[4]] <- airmiles
k[[5]] <- trees
k[[6]] <- treering
and selecting it with
k[c(1:3,6)]
How it is possible to do same in S4 class?
for example I create the some data from dismo package:
library(dismo)
example(voronoi)
that performs following:
p <- matrix(c(17, 42, 85, 70, 19, 53, 26, 84, 84, 46, 48, 85, 4, 95, 48, 54, 66, 74, 50, 48,
28, 73, 38, 56, 43, 29, 63, 22, 46, 45, 7, 60, 46, 34, 14, 51, 70, 31, 39, 26), ncol=2)
v <- voronoi(p)
v
I want to select the coordinates of a polygon, it can be done with.
v@polygons[[1]]@Polygons[[1]]@coords.
My question is How to select for example 1 to 3rd and sixth component?
my idea to use
v@polygons[c(1:3,6)]@Polygons[[1]]@coords
does not work. R says:
Error: trying to get slot "Polygons" from an object of a basic class ("list") with no slots
r
edited Nov 20 '18 at 14:11
John Coleman
34.3k53272
asked Nov 20 '18 at 14:06
smurfit89smurfit89
82212
in R it is possible to create a list
k <- list()
k[[1]] <- airquality
k[[2]] <- rock
k[[3]] <- AirPassengers
k[[4]] <- airmiles
k[[5]] <- trees
k[[6]] <- treering
and selecting it with
k[c(1:3,6)]
How it is possible to do same in S4 class?
for example I create the some data from dismo package:
library(dismo)
example(voronoi)
that performs following:
p <- matrix(c(17, 42, 85, 70, 19, 53, 26, 84, 84, 46, 48, 85, 4, 95, 48, 54, 66, 74, 50, 48,
28, 73, 38, 56, 43, 29, 63, 22, 46, 45, 7, 60, 46, 34, 14, 51, 70, 31, 39, 26), ncol=2)
v <- voronoi(p)
v
I want to select the coordinates of a polygon, it can be done with.
v@polygons[[1]]@Polygons[[1]]@coords.
My question is How to select for example 1 to 3rd and sixth component?
my idea to use
v@polygons[c(1:3,6)]@Polygons[[1]]@coords
does not work. R says:
Error: trying to get slot "Polygons" from an object of a basic class ("list") with no slots
r
r
edited Nov 20 '18 at 14:11
John Coleman
34.3k53272
asked Nov 20 '18 at 14:06
smurfit89smurfit89
82212
edited Nov 20 '18 at 14:11
John Coleman
34.3k53272
asked Nov 20 '18 at 14:06
smurfit89smurfit89
82212
edited Nov 20 '18 at 14:11
John Coleman
34.3k53272
edited Nov 20 '18 at 14:11
John Coleman
34.3k53272
edited Nov 20 '18 at 14:11
John Coleman
34.3k53272
34.3k53272
asked Nov 20 '18 at 14:06
smurfit89smurfit89
82212
asked Nov 20 '18 at 14:06
smurfit89smurfit89
82212
asked Nov 20 '18 at 14:06
smurfit89smurfit89
82212
82212
add a comment |
add a comment |
1 Answer
1
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votes
The problem isn't with v@polygons[c(1:3,6)] but rather in the attempt to apply @Polygons[[1]]@coords directly to the resulting list. instead, you could use lapply() on v@polygons[c(1:3,6)] like this:
result <- lapply(v@polygons[c(1:3,6)], function(x) x@Polygons[[1]]@coords)
which works as expected.
answered Nov 20 '18 at 14:21
John ColemanJohn Coleman
34.3k53272
But I am still wondering why this information is not in the documentation
– smurfit89
Nov 20 '18 at 14:28
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
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oldest
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active
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votes
The problem isn't with v@polygons[c(1:3,6)] but rather in the attempt to apply @Polygons[[1]]@coords directly to the resulting list. instead, you could use lapply() on v@polygons[c(1:3,6)] like this:
result <- lapply(v@polygons[c(1:3,6)], function(x) x@Polygons[[1]]@coords)
which works as expected.
answered Nov 20 '18 at 14:21
John ColemanJohn Coleman
34.3k53272
But I am still wondering why this information is not in the documentation
– smurfit89
Nov 20 '18 at 14:28
add a comment |
The problem isn't with v@polygons[c(1:3,6)] but rather in the attempt to apply @Polygons[[1]]@coords directly to the resulting list. instead, you could use lapply() on v@polygons[c(1:3,6)] like this:
result <- lapply(v@polygons[c(1:3,6)], function(x) x@Polygons[[1]]@coords)
which works as expected.
answered Nov 20 '18 at 14:21
John ColemanJohn Coleman
34.3k53272
But I am still wondering why this information is not in the documentation
– smurfit89
Nov 20 '18 at 14:28
add a comment |
The problem isn't with v@polygons[c(1:3,6)] but rather in the attempt to apply @Polygons[[1]]@coords directly to the resulting list. instead, you could use lapply() on v@polygons[c(1:3,6)] like this:
result <- lapply(v@polygons[c(1:3,6)], function(x) x@Polygons[[1]]@coords)
which works as expected.
answered Nov 20 '18 at 14:21
John ColemanJohn Coleman
34.3k53272
The problem isn't with v@polygons[c(1:3,6)] but rather in the attempt to apply @Polygons[[1]]@coords directly to the resulting list. instead, you could use lapply() on v@polygons[c(1:3,6)] like this:
result <- lapply(v@polygons[c(1:3,6)], function(x) x@Polygons[[1]]@coords)
which works as expected.
answered Nov 20 '18 at 14:21
John ColemanJohn Coleman
34.3k53272
answered Nov 20 '18 at 14:21
John ColemanJohn Coleman
34.3k53272
answered Nov 20 '18 at 14:21
John ColemanJohn Coleman
34.3k53272
answered Nov 20 '18 at 14:21
John ColemanJohn Coleman
34.3k53272
34.3k53272
But I am still wondering why this information is not in the documentation
– smurfit89
Nov 20 '18 at 14:28
add a comment |
But I am still wondering why this information is not in the documentation
– smurfit89
Nov 20 '18 at 14:28
But I am still wondering why this information is not in the documentation
– smurfit89
Nov 20 '18 at 14:28
But I am still wondering why this information is not in the documentation
– smurfit89
Nov 20 '18 at 14:28
add a comment |
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