How does the overloading of the assignment operator in combination of the length function work?
How does the mutating implementation of length() actually work?
Example: Give a vector v, how does this set the length to 12?
length(v) <- 12
Can I create my own function that can overload an operator in the same way?
Example: Set every other element to 7
everyOther(v) <- 7
r operator-overloading
asked Nov 25 '18 at 20:36
KarlPKarlP
4,27821938
add a comment |
How does the mutating implementation of length() actually work?
Example: Give a vector v, how does this set the length to 12?
length(v) <- 12
Can I create my own function that can overload an operator in the same way?
Example: Set every other element to 7
everyOther(v) <- 7
r operator-overloading
asked Nov 25 '18 at 20:36
KarlPKarlP
4,27821938
add a comment |
How does the mutating implementation of length() actually work?
Example: Give a vector v, how does this set the length to 12?
length(v) <- 12
Can I create my own function that can overload an operator in the same way?
Example: Set every other element to 7
everyOther(v) <- 7
r operator-overloading
asked Nov 25 '18 at 20:36
KarlPKarlP
4,27821938
How does the mutating implementation of length() actually work?
Example: Give a vector v, how does this set the length to 12?
length(v) <- 12
Can I create my own function that can overload an operator in the same way?
Example: Set every other element to 7
everyOther(v) <- 7
r operator-overloading
r operator-overloading
asked Nov 25 '18 at 20:36
KarlPKarlP
4,27821938
asked Nov 25 '18 at 20:36
KarlPKarlP
4,27821938
asked Nov 25 '18 at 20:36
KarlPKarlP
4,27821938
asked Nov 25 '18 at 20:36
KarlPKarlP
4,27821938
asked Nov 25 '18 at 20:36
KarlPKarlP
4,27821938
4,27821938
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Those assignment functions are just that, functions. They can be written in the following form (note the backticks - they must be used), where fname distinguishes the function name.
`fname<-` <- function(x, value) { ... }
So your everyOther assignment function can be written as
`everyOther<-` <- function(x, value) {
x[c(FALSE, TRUE)] <- value
x
}
And we can use it just as we would length(x) <- value
v <- 1:20
everyOther(v) <- 7
v
# [1] 1 7 3 7 5 7 7 7 9 7 11 7 13 7 15 7 17 7 19 7
answered Nov 25 '18 at 20:53
Rich ScrivenRich Scriven
77.3k8103173
I was wondering if you meantnamesin your example rather thanname?
– prosoitos
Nov 25 '18 at 21:25
@prosoitos - I didn't. I usednameto mean the name of the function.
– Rich Scriven
Nov 25 '18 at 21:25
1
Got you. I thought you were using an existing accessor function as an example and I didn't realize that "name" was used to mean "name of function". Great explanation by the way :)
– prosoitos
Nov 25 '18 at 21:28
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Those assignment functions are just that, functions. They can be written in the following form (note the backticks - they must be used), where fname distinguishes the function name.
`fname<-` <- function(x, value) { ... }
So your everyOther assignment function can be written as
`everyOther<-` <- function(x, value) {
x[c(FALSE, TRUE)] <- value
x
}
And we can use it just as we would length(x) <- value
v <- 1:20
everyOther(v) <- 7
v
# [1] 1 7 3 7 5 7 7 7 9 7 11 7 13 7 15 7 17 7 19 7
answered Nov 25 '18 at 20:53
Rich ScrivenRich Scriven
77.3k8103173
I was wondering if you meantnamesin your example rather thanname?
– prosoitos
Nov 25 '18 at 21:25
@prosoitos - I didn't. I usednameto mean the name of the function.
– Rich Scriven
Nov 25 '18 at 21:25
1
Got you. I thought you were using an existing accessor function as an example and I didn't realize that "name" was used to mean "name of function". Great explanation by the way :)
– prosoitos
Nov 25 '18 at 21:28
add a comment |
Those assignment functions are just that, functions. They can be written in the following form (note the backticks - they must be used), where fname distinguishes the function name.
`fname<-` <- function(x, value) { ... }
So your everyOther assignment function can be written as
`everyOther<-` <- function(x, value) {
x[c(FALSE, TRUE)] <- value
x
}
And we can use it just as we would length(x) <- value
v <- 1:20
everyOther(v) <- 7
v
# [1] 1 7 3 7 5 7 7 7 9 7 11 7 13 7 15 7 17 7 19 7
answered Nov 25 '18 at 20:53
Rich ScrivenRich Scriven
77.3k8103173
I was wondering if you meantnamesin your example rather thanname?
– prosoitos
Nov 25 '18 at 21:25
@prosoitos - I didn't. I usednameto mean the name of the function.
– Rich Scriven
Nov 25 '18 at 21:25
1
Got you. I thought you were using an existing accessor function as an example and I didn't realize that "name" was used to mean "name of function". Great explanation by the way :)
– prosoitos
Nov 25 '18 at 21:28
add a comment |
Those assignment functions are just that, functions. They can be written in the following form (note the backticks - they must be used), where fname distinguishes the function name.
`fname<-` <- function(x, value) { ... }
So your everyOther assignment function can be written as
`everyOther<-` <- function(x, value) {
x[c(FALSE, TRUE)] <- value
x
}
And we can use it just as we would length(x) <- value
v <- 1:20
everyOther(v) <- 7
v
# [1] 1 7 3 7 5 7 7 7 9 7 11 7 13 7 15 7 17 7 19 7
answered Nov 25 '18 at 20:53
Rich ScrivenRich Scriven
77.3k8103173
Those assignment functions are just that, functions. They can be written in the following form (note the backticks - they must be used), where fname distinguishes the function name.
`fname<-` <- function(x, value) { ... }
So your everyOther assignment function can be written as
`everyOther<-` <- function(x, value) {
x[c(FALSE, TRUE)] <- value
x
}
And we can use it just as we would length(x) <- value
v <- 1:20
everyOther(v) <- 7
v
# [1] 1 7 3 7 5 7 7 7 9 7 11 7 13 7 15 7 17 7 19 7
answered Nov 25 '18 at 20:53
Rich ScrivenRich Scriven
77.3k8103173
edited Nov 25 '18 at 21:26
answered Nov 25 '18 at 20:53
Rich ScrivenRich Scriven
77.3k8103173
answered Nov 25 '18 at 20:53
Rich ScrivenRich Scriven
77.3k8103173
answered Nov 25 '18 at 20:53
Rich ScrivenRich Scriven
77.3k8103173
77.3k8103173
I was wondering if you meantnamesin your example rather thanname?
– prosoitos
Nov 25 '18 at 21:25
@prosoitos - I didn't. I usednameto mean the name of the function.
– Rich Scriven
Nov 25 '18 at 21:25
1
Got you. I thought you were using an existing accessor function as an example and I didn't realize that "name" was used to mean "name of function". Great explanation by the way :)
– prosoitos
Nov 25 '18 at 21:28
add a comment |
I was wondering if you meantnamesin your example rather thanname?
– prosoitos
Nov 25 '18 at 21:25
@prosoitos - I didn't. I usednameto mean the name of the function.
– Rich Scriven
Nov 25 '18 at 21:25
1
Got you. I thought you were using an existing accessor function as an example and I didn't realize that "name" was used to mean "name of function". Great explanation by the way :)
– prosoitos
Nov 25 '18 at 21:28
I was wondering if you meant
names in your example rather than name?– prosoitos
Nov 25 '18 at 21:25
I was wondering if you meant
names in your example rather than name?– prosoitos
Nov 25 '18 at 21:25
@prosoitos - I didn't. I used
name to mean the name of the function.– Rich Scriven
Nov 25 '18 at 21:25
@prosoitos - I didn't. I used
name to mean the name of the function.– Rich Scriven
Nov 25 '18 at 21:25
1
1
Got you. I thought you were using an existing accessor function as an example and I didn't realize that "name" was used to mean "name of function". Great explanation by the way :)
– prosoitos
Nov 25 '18 at 21:28
Got you. I thought you were using an existing accessor function as an example and I didn't realize that "name" was used to mean "name of function". Great explanation by the way :)
– prosoitos
Nov 25 '18 at 21:28
add a comment |
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