R: How to pass an object to a function?

I'm newbie in R and I'm trying to pass an object to a function but I've got an error when I try to access to a slot of this object.

These are my main code:

x <- new("menu", competition=0, stats=0, query="")

y <- show(x)

show_graphics(y)

After second instruction I've got the object "y" created correctly like you can see in this screencap:

enter image description here

Then, I call to a the function "show_graphics" and pass this object "y" like a parameter. But when I try to access to an slot in the first insctruction of my function:

show_graphics <- function(menu){

  data <- getData(menu@query)

  ......

}

I've got an error that tell me that there is an error to try to access
to the slot "query" of an object to the basic class "function" without
slots.

How can I pass correctly an object to a function? Or how can I get the values from an object passed to a function?

Am I doing something wrong?

Edit I:

This is the code to create the object "menu":

setClass("menu", slots=list(competition="numeric", stats="numeric", query="character"))

show <- function(object) 0

setGeneric("show")

setMethod("show", "menu", function(object){

  object@competition <- 14

  object@stats <- 1

  object@query <- "query"

  return (object)

})

Edit II:

getData is another function, here is the code of a prototype:

getData <- function(query){

   return (query)

}

edited Nov 19 '18 at 13:51

asked Nov 19 '18 at 12:42

José Carlos

68321944

1

I'm not able to re-produce. When I try to run the x <- new(.. line, I get the error: Error in getClass(Class, where = topenv(parent.frame())) : “menu” is not a defined class. Are you able to include all relevant code, please?
– Jonny Phelps
Nov 19 '18 at 12:52

I have edited my original post where I have added a prototype of the menu object
– José Carlos
Nov 19 '18 at 13:22

Thank you. I'm still struggling unfortunately. y <- show(x) gives me the error Error in show(x) : object 'competition' not found & show_graphics(y) gives me the error Error in getData(menu@query) : could not find function "getData". Might be worth making a simpler version of the problem that's fully re-producible
– Jonny Phelps
Nov 19 '18 at 13:31

Sorry, I have forget to return the object. I have updated the code from Edit I and created an function prototype of getData in Edit II
– José Carlos
Nov 19 '18 at 13:38

Thank you. It's weird, I don't get any error when running show_graphics(y) now (if I remove the ......). Unrelated but you could try using R6 classes for object orientated approach. It's well supported with good documentation: adv-r.hadley.nz/r6.html
– Jonny Phelps
Nov 19 '18 at 15:07

|
show 1 more comment

I'm newbie in R and I'm trying to pass an object to a function but I've got an error when I try to access to a slot of this object.

These are my main code:

x <- new("menu", competition=0, stats=0, query="")

y <- show(x)

show_graphics(y)

After second instruction I've got the object "y" created correctly like you can see in this screencap:

enter image description here

Then, I call to a the function "show_graphics" and pass this object "y" like a parameter. But when I try to access to an slot in the first insctruction of my function:

show_graphics <- function(menu){

  data <- getData(menu@query)

  ......

}

I've got an error that tell me that there is an error to try to access
to the slot "query" of an object to the basic class "function" without
slots.

How can I pass correctly an object to a function? Or how can I get the values from an object passed to a function?

Am I doing something wrong?

Edit I:

This is the code to create the object "menu":

setClass("menu", slots=list(competition="numeric", stats="numeric", query="character"))

show <- function(object) 0

setGeneric("show")

setMethod("show", "menu", function(object){

  object@competition <- 14

  object@stats <- 1

  object@query <- "query"

  return (object)

})

Edit II:

getData is another function, here is the code of a prototype:

getData <- function(query){

   return (query)

}

edited Nov 19 '18 at 13:51

asked Nov 19 '18 at 12:42

José Carlos

68321944

1

I'm not able to re-produce. When I try to run the x <- new(.. line, I get the error: Error in getClass(Class, where = topenv(parent.frame())) : “menu” is not a defined class. Are you able to include all relevant code, please?
– Jonny Phelps
Nov 19 '18 at 12:52

I have edited my original post where I have added a prototype of the menu object
– José Carlos
Nov 19 '18 at 13:22

Thank you. I'm still struggling unfortunately. y <- show(x) gives me the error Error in show(x) : object 'competition' not found & show_graphics(y) gives me the error Error in getData(menu@query) : could not find function "getData". Might be worth making a simpler version of the problem that's fully re-producible
– Jonny Phelps
Nov 19 '18 at 13:31

Sorry, I have forget to return the object. I have updated the code from Edit I and created an function prototype of getData in Edit II
– José Carlos
Nov 19 '18 at 13:38

Thank you. It's weird, I don't get any error when running show_graphics(y) now (if I remove the ......). Unrelated but you could try using R6 classes for object orientated approach. It's well supported with good documentation: adv-r.hadley.nz/r6.html
– Jonny Phelps
Nov 19 '18 at 15:07

|
show 1 more comment

I'm newbie in R and I'm trying to pass an object to a function but I've got an error when I try to access to a slot of this object.

These are my main code:

x <- new("menu", competition=0, stats=0, query="")

y <- show(x)

show_graphics(y)

After second instruction I've got the object "y" created correctly like you can see in this screencap:

enter image description here

Then, I call to a the function "show_graphics" and pass this object "y" like a parameter. But when I try to access to an slot in the first insctruction of my function:

show_graphics <- function(menu){

  data <- getData(menu@query)

  ......

}

I've got an error that tell me that there is an error to try to access
to the slot "query" of an object to the basic class "function" without
slots.

How can I pass correctly an object to a function? Or how can I get the values from an object passed to a function?

Am I doing something wrong?

Edit I:

This is the code to create the object "menu":

setClass("menu", slots=list(competition="numeric", stats="numeric", query="character"))

show <- function(object) 0

setGeneric("show")

setMethod("show", "menu", function(object){

  object@competition <- 14

  object@stats <- 1

  object@query <- "query"

  return (object)

})

Edit II:

getData is another function, here is the code of a prototype:

getData <- function(query){

   return (query)

}

edited Nov 19 '18 at 13:51

asked Nov 19 '18 at 12:42

José Carlos

68321944

I'm newbie in R and I'm trying to pass an object to a function but I've got an error when I try to access to a slot of this object.

These are my main code:

x <- new("menu", competition=0, stats=0, query="")

y <- show(x)

show_graphics(y)

After second instruction I've got the object "y" created correctly like you can see in this screencap:

enter image description here

Then, I call to a the function "show_graphics" and pass this object "y" like a parameter. But when I try to access to an slot in the first insctruction of my function:

show_graphics <- function(menu){

  data <- getData(menu@query)

  ......

}

I've got an error that tell me that there is an error to try to access
to the slot "query" of an object to the basic class "function" without
slots.

How can I pass correctly an object to a function? Or how can I get the values from an object passed to a function?

Am I doing something wrong?

Edit I:

This is the code to create the object "menu":

setClass("menu", slots=list(competition="numeric", stats="numeric", query="character"))

show <- function(object) 0

setGeneric("show")

setMethod("show", "menu", function(object){

  object@competition <- 14

  object@stats <- 1

  object@query <- "query"

  return (object)

})

Edit II:

getData is another function, here is the code of a prototype:

getData <- function(query){

   return (query)

}

r function oop

edited Nov 19 '18 at 13:51

asked Nov 19 '18 at 12:42

José Carlos

68321944

edited Nov 19 '18 at 13:51

asked Nov 19 '18 at 12:42

José Carlos

68321944

edited Nov 19 '18 at 13:51

asked Nov 19 '18 at 12:42

José Carlos

68321944

asked Nov 19 '18 at 12:42

José Carlos

68321944

asked Nov 19 '18 at 12:42

José Carlos

68321944

1

I'm not able to re-produce. When I try to run the x <- new(.. line, I get the error: Error in getClass(Class, where = topenv(parent.frame())) : “menu” is not a defined class. Are you able to include all relevant code, please?
– Jonny Phelps
Nov 19 '18 at 12:52

I have edited my original post where I have added a prototype of the menu object
– José Carlos
Nov 19 '18 at 13:22

Thank you. I'm still struggling unfortunately. y <- show(x) gives me the error Error in show(x) : object 'competition' not found & show_graphics(y) gives me the error Error in getData(menu@query) : could not find function "getData". Might be worth making a simpler version of the problem that's fully re-producible
– Jonny Phelps
Nov 19 '18 at 13:31

Sorry, I have forget to return the object. I have updated the code from Edit I and created an function prototype of getData in Edit II
– José Carlos
Nov 19 '18 at 13:38

Thank you. It's weird, I don't get any error when running show_graphics(y) now (if I remove the ......). Unrelated but you could try using R6 classes for object orientated approach. It's well supported with good documentation: adv-r.hadley.nz/r6.html
– Jonny Phelps
Nov 19 '18 at 15:07

|
show 1 more comment

1

I'm not able to re-produce. When I try to run the x <- new(.. line, I get the error: Error in getClass(Class, where = topenv(parent.frame())) : “menu” is not a defined class. Are you able to include all relevant code, please?
– Jonny Phelps
Nov 19 '18 at 12:52

I have edited my original post where I have added a prototype of the menu object
– José Carlos
Nov 19 '18 at 13:22

Thank you. I'm still struggling unfortunately. y <- show(x) gives me the error Error in show(x) : object 'competition' not found & show_graphics(y) gives me the error Error in getData(menu@query) : could not find function "getData". Might be worth making a simpler version of the problem that's fully re-producible
– Jonny Phelps
Nov 19 '18 at 13:31

Sorry, I have forget to return the object. I have updated the code from Edit I and created an function prototype of getData in Edit II
– José Carlos
Nov 19 '18 at 13:38

Thank you. It's weird, I don't get any error when running show_graphics(y) now (if I remove the ......). Unrelated but you could try using R6 classes for object orientated approach. It's well supported with good documentation: adv-r.hadley.nz/r6.html
– Jonny Phelps
Nov 19 '18 at 15:07

I'm not able to re-produce. When I try to run the x <- new(.. line, I get the error: Error in getClass(Class, where = topenv(parent.frame())) : “menu” is not a defined class. Are you able to include all relevant code, please?
– Jonny Phelps
Nov 19 '18 at 12:52

I have edited my original post where I have added a prototype of the menu object
– José Carlos
Nov 19 '18 at 13:22

Thank you. I'm still struggling unfortunately. y <- show(x) gives me the error Error in show(x) : object 'competition' not found & show_graphics(y) gives me the error Error in getData(menu@query) : could not find function "getData". Might be worth making a simpler version of the problem that's fully re-producible
– Jonny Phelps
Nov 19 '18 at 13:31

Sorry, I have forget to return the object. I have updated the code from Edit I and created an function prototype of getData in Edit II
– José Carlos
Nov 19 '18 at 13:38

Thank you. It's weird, I don't get any error when running show_graphics(y) now (if I remove the ......). Unrelated but you could try using R6 classes for object orientated approach. It's well supported with good documentation: adv-r.hadley.nz/r6.html
– Jonny Phelps
Nov 19 '18 at 15:07

|
show 1 more comment

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