What does the “slot doesn't exist” error message mean?
I'm trying to write an object and access to his parameters. I've got two files, menus.R, where I define the object, and main.R, where I use the object and try to access to a slot (parameter).
The code of both files are next:
menus.R
menu <- setClass("menu", slots=list(competition="numeric", stats="numeric"))
setMethod("show", "menu", function(object){
while (TRUE){
#Clean console
cat("14")
cat("COMPARATIVA ENTRE EQUIPOS DE LA MISMA COMPETICIONn")
cat("-------------------------------------------------nn")
cat("1. Comparativa entre clubes de Liga DIAn")
cat("2. Comparativa entre clubes de Liga Femenina 2 - Grupo 'A'n")
cat("3. Comparativa entre clubes de Liga Femenina 2 - Grupo 'B'n")
cat("0. Salirnn")
option <- readline("Selecciona opción: ")
option <- suppressWarnings(as.numeric(option))
if (!is.na(option)){
if (option == 1){
object@competition <- 14
}
if (option == 2){
object@competition <- 22
}
if (option == 3){
object@competition <- 23
}
readline("Espera ...")
if (option == 0)
break
}else{
readline("No es un número. Pulsa una tecla para introducir otra opción.")
}
}
})
main.R
menu(competition=0, stats=0)
print(menu@competition)
getClass(class(menu))
When I call menu(competition=0, stats=0) I can see what the method show gives me to me. This is correct. In show method I assign a value to competition. When I exit from show method the next instruction is print(menu@competition) and here is where I've got this error:
Error in print(menu@competition) : there is no a slot with name
"competition" for this object class "classGeneratorFunction"
Then with getClass(class(menu)) I've got this:
What am I doing wrong? How can I get access to competition or stats?
r oop s4
edited Nov 13 '18 at 10:06
Konrad Rudolph
394k1017801025
asked Nov 13 '18 at 9:43
José CarlosJosé Carlos
68821944
add a comment |
I'm trying to write an object and access to his parameters. I've got two files, menus.R, where I define the object, and main.R, where I use the object and try to access to a slot (parameter).
The code of both files are next:
menus.R
menu <- setClass("menu", slots=list(competition="numeric", stats="numeric"))
setMethod("show", "menu", function(object){
while (TRUE){
#Clean console
cat("14")
cat("COMPARATIVA ENTRE EQUIPOS DE LA MISMA COMPETICIONn")
cat("-------------------------------------------------nn")
cat("1. Comparativa entre clubes de Liga DIAn")
cat("2. Comparativa entre clubes de Liga Femenina 2 - Grupo 'A'n")
cat("3. Comparativa entre clubes de Liga Femenina 2 - Grupo 'B'n")
cat("0. Salirnn")
option <- readline("Selecciona opción: ")
option <- suppressWarnings(as.numeric(option))
if (!is.na(option)){
if (option == 1){
object@competition <- 14
}
if (option == 2){
object@competition <- 22
}
if (option == 3){
object@competition <- 23
}
readline("Espera ...")
if (option == 0)
break
}else{
readline("No es un número. Pulsa una tecla para introducir otra opción.")
}
}
})
main.R
menu(competition=0, stats=0)
print(menu@competition)
getClass(class(menu))
When I call menu(competition=0, stats=0) I can see what the method show gives me to me. This is correct. In show method I assign a value to competition. When I exit from show method the next instruction is print(menu@competition) and here is where I've got this error:
Error in print(menu@competition) : there is no a slot with name
"competition" for this object class "classGeneratorFunction"
Then with getClass(class(menu)) I've got this:
What am I doing wrong? How can I get access to competition or stats?
r oop s4
edited Nov 13 '18 at 10:06
Konrad Rudolph
394k1017801025
asked Nov 13 '18 at 9:43
José CarlosJosé Carlos
68821944
1
Sorry, but I don't see you assigning an object anywhere:x <- menu(competition=0, stats=0); print(x@competition)
– Roland
Nov 13 '18 at 9:59
Side note: please don't post images of code or text, just copy and paste the text itself and format as code block
– akraf
Nov 13 '18 at 10:05
Please take a moment to review my changes to your question and learn about the formatting options on Stack Overflow.
– Konrad Rudolph
Nov 13 '18 at 10:08
add a comment |
I'm trying to write an object and access to his parameters. I've got two files, menus.R, where I define the object, and main.R, where I use the object and try to access to a slot (parameter).
The code of both files are next:
menus.R
menu <- setClass("menu", slots=list(competition="numeric", stats="numeric"))
setMethod("show", "menu", function(object){
while (TRUE){
#Clean console
cat("14")
cat("COMPARATIVA ENTRE EQUIPOS DE LA MISMA COMPETICIONn")
cat("-------------------------------------------------nn")
cat("1. Comparativa entre clubes de Liga DIAn")
cat("2. Comparativa entre clubes de Liga Femenina 2 - Grupo 'A'n")
cat("3. Comparativa entre clubes de Liga Femenina 2 - Grupo 'B'n")
cat("0. Salirnn")
option <- readline("Selecciona opción: ")
option <- suppressWarnings(as.numeric(option))
if (!is.na(option)){
if (option == 1){
object@competition <- 14
}
if (option == 2){
object@competition <- 22
}
if (option == 3){
object@competition <- 23
}
readline("Espera ...")
if (option == 0)
break
}else{
readline("No es un número. Pulsa una tecla para introducir otra opción.")
}
}
})
main.R
menu(competition=0, stats=0)
print(menu@competition)
getClass(class(menu))
When I call menu(competition=0, stats=0) I can see what the method show gives me to me. This is correct. In show method I assign a value to competition. When I exit from show method the next instruction is print(menu@competition) and here is where I've got this error:
Error in print(menu@competition) : there is no a slot with name
"competition" for this object class "classGeneratorFunction"
Then with getClass(class(menu)) I've got this:
What am I doing wrong? How can I get access to competition or stats?
r oop s4
edited Nov 13 '18 at 10:06
Konrad Rudolph
394k1017801025
asked Nov 13 '18 at 9:43
José CarlosJosé Carlos
68821944
I'm trying to write an object and access to his parameters. I've got two files, menus.R, where I define the object, and main.R, where I use the object and try to access to a slot (parameter).
The code of both files are next:
menus.R
menu <- setClass("menu", slots=list(competition="numeric", stats="numeric"))
setMethod("show", "menu", function(object){
while (TRUE){
#Clean console
cat("14")
cat("COMPARATIVA ENTRE EQUIPOS DE LA MISMA COMPETICIONn")
cat("-------------------------------------------------nn")
cat("1. Comparativa entre clubes de Liga DIAn")
cat("2. Comparativa entre clubes de Liga Femenina 2 - Grupo 'A'n")
cat("3. Comparativa entre clubes de Liga Femenina 2 - Grupo 'B'n")
cat("0. Salirnn")
option <- readline("Selecciona opción: ")
option <- suppressWarnings(as.numeric(option))
if (!is.na(option)){
if (option == 1){
object@competition <- 14
}
if (option == 2){
object@competition <- 22
}
if (option == 3){
object@competition <- 23
}
readline("Espera ...")
if (option == 0)
break
}else{
readline("No es un número. Pulsa una tecla para introducir otra opción.")
}
}
})
main.R
menu(competition=0, stats=0)
print(menu@competition)
getClass(class(menu))
When I call menu(competition=0, stats=0) I can see what the method show gives me to me. This is correct. In show method I assign a value to competition. When I exit from show method the next instruction is print(menu@competition) and here is where I've got this error:
Error in print(menu@competition) : there is no a slot with name
"competition" for this object class "classGeneratorFunction"
Then with getClass(class(menu)) I've got this:
What am I doing wrong? How can I get access to competition or stats?
r oop s4
r oop s4
edited Nov 13 '18 at 10:06
Konrad Rudolph
394k1017801025
asked Nov 13 '18 at 9:43
José CarlosJosé Carlos
68821944
edited Nov 13 '18 at 10:06
Konrad Rudolph
394k1017801025
asked Nov 13 '18 at 9:43
José CarlosJosé Carlos
68821944
edited Nov 13 '18 at 10:06
Konrad Rudolph
394k1017801025
edited Nov 13 '18 at 10:06
Konrad Rudolph
394k1017801025
edited Nov 13 '18 at 10:06
Konrad Rudolph
394k1017801025
394k1017801025
asked Nov 13 '18 at 9:43
José CarlosJosé Carlos
68821944
asked Nov 13 '18 at 9:43
José CarlosJosé Carlos
68821944
asked Nov 13 '18 at 9:43
José CarlosJosé Carlos
68821944
68821944
1
Sorry, but I don't see you assigning an object anywhere:x <- menu(competition=0, stats=0); print(x@competition)
– Roland
Nov 13 '18 at 9:59
Side note: please don't post images of code or text, just copy and paste the text itself and format as code block
– akraf
Nov 13 '18 at 10:05
Please take a moment to review my changes to your question and learn about the formatting options on Stack Overflow.
– Konrad Rudolph
Nov 13 '18 at 10:08
add a comment |
1
Sorry, but I don't see you assigning an object anywhere:x <- menu(competition=0, stats=0); print(x@competition)
– Roland
Nov 13 '18 at 9:59
Side note: please don't post images of code or text, just copy and paste the text itself and format as code block
– akraf
Nov 13 '18 at 10:05
Please take a moment to review my changes to your question and learn about the formatting options on Stack Overflow.
– Konrad Rudolph
Nov 13 '18 at 10:08
1
1
Sorry, but I don't see you assigning an object anywhere:
x <- menu(competition=0, stats=0); print(x@competition)– Roland
Nov 13 '18 at 9:59
Sorry, but I don't see you assigning an object anywhere:
x <- menu(competition=0, stats=0); print(x@competition)– Roland
Nov 13 '18 at 9:59
Side note: please don't post images of code or text, just copy and paste the text itself and format as code block
– akraf
Nov 13 '18 at 10:05
Side note: please don't post images of code or text, just copy and paste the text itself and format as code block
– akraf
Nov 13 '18 at 10:05
Please take a moment to review my changes to your question and learn about the formatting options on Stack Overflow.
– Konrad Rudolph
Nov 13 '18 at 10:08
Please take a moment to review my changes to your question and learn about the formatting options on Stack Overflow.
– Konrad Rudolph
Nov 13 '18 at 10:08
add a comment |
1 Answer
1
active
oldest
votes
You are confusing the object constructor with the object itself.
menu(competition = 0, stats=0) generates you a new object of class menu, but you fail to save it somewhere, so it prints on the screen. Therefore your first, correct output.
But then, you want to manipulate the object. But you didn't save it! Instead, you try to manipulate the "object factory", menu(). The Type of the "object factory" is classGeneratorFunction, that's what you see.
This should work:
myMenuObject <- menu(competition=0, stats=0)
print(myMenuObject)
print(myMenuObject@competition)
getClass(class(myMenuObject))
answered Nov 13 '18 at 10:03
akrafakraf
1,399823
add a comment |
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You are confusing the object constructor with the object itself.
menu(competition = 0, stats=0) generates you a new object of class menu, but you fail to save it somewhere, so it prints on the screen. Therefore your first, correct output.
But then, you want to manipulate the object. But you didn't save it! Instead, you try to manipulate the "object factory", menu(). The Type of the "object factory" is classGeneratorFunction, that's what you see.
This should work:
myMenuObject <- menu(competition=0, stats=0)
print(myMenuObject)
print(myMenuObject@competition)
getClass(class(myMenuObject))
answered Nov 13 '18 at 10:03
akrafakraf
1,399823
add a comment |
You are confusing the object constructor with the object itself.
menu(competition = 0, stats=0) generates you a new object of class menu, but you fail to save it somewhere, so it prints on the screen. Therefore your first, correct output.
But then, you want to manipulate the object. But you didn't save it! Instead, you try to manipulate the "object factory", menu(). The Type of the "object factory" is classGeneratorFunction, that's what you see.
This should work:
myMenuObject <- menu(competition=0, stats=0)
print(myMenuObject)
print(myMenuObject@competition)
getClass(class(myMenuObject))
answered Nov 13 '18 at 10:03
akrafakraf
1,399823
add a comment |
You are confusing the object constructor with the object itself.
menu(competition = 0, stats=0) generates you a new object of class menu, but you fail to save it somewhere, so it prints on the screen. Therefore your first, correct output.
But then, you want to manipulate the object. But you didn't save it! Instead, you try to manipulate the "object factory", menu(). The Type of the "object factory" is classGeneratorFunction, that's what you see.
This should work:
myMenuObject <- menu(competition=0, stats=0)
print(myMenuObject)
print(myMenuObject@competition)
getClass(class(myMenuObject))
answered Nov 13 '18 at 10:03
akrafakraf
1,399823
You are confusing the object constructor with the object itself.
menu(competition = 0, stats=0) generates you a new object of class menu, but you fail to save it somewhere, so it prints on the screen. Therefore your first, correct output.
But then, you want to manipulate the object. But you didn't save it! Instead, you try to manipulate the "object factory", menu(). The Type of the "object factory" is classGeneratorFunction, that's what you see.
This should work:
myMenuObject <- menu(competition=0, stats=0)
print(myMenuObject)
print(myMenuObject@competition)
getClass(class(myMenuObject))
answered Nov 13 '18 at 10:03
akrafakraf
1,399823
answered Nov 13 '18 at 10:03
akrafakraf
1,399823
answered Nov 13 '18 at 10:03
akrafakraf
1,399823
answered Nov 13 '18 at 10:03
akrafakraf
1,399823
1,399823
add a comment |
add a comment |
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1
Sorry, but I don't see you assigning an object anywhere:
x <- menu(competition=0, stats=0); print(x@competition)– Roland
Nov 13 '18 at 9:59
Side note: please don't post images of code or text, just copy and paste the text itself and format as code block
– akraf
Nov 13 '18 at 10:05
Please take a moment to review my changes to your question and learn about the formatting options on Stack Overflow.
– Konrad Rudolph
Nov 13 '18 at 10:08