Confused by warning when using the “dot dot prefix” (..) in data.table









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I want to sum some columns in a data.table, specifying those columns in a variable. I then use the .. prefix (see New Features data.table 1.10.2) to select those columns. However, this results in a Warning:



mdt <- as.data.table(mtcars)
factorsGEN <- c("disp","hp","drat")
# This works but gives the warning below
mdt[ , score := rowSums(mdt[ , ..factorsGEN])]
#Warning message:
# In `[.data.table`(mdt, , ..factorsGEN) :
# Both 'factorsGEN' and '..factorsGEN' exist in calling scope. Please remove 
# the '..factorsGEN' variable in calling scope for clarity.

# This does not work, results in error because factorsGEN is not found
mdt[, score := rowSums(mdt[, factorsGEN])]


I get a warning, which I don't remember getting when I first wrote the code, so it may be the result of an update to the data.table code. Could anyone please tell me how to avoid the warning. I can't figure it out.






r data.table







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  • 1




    This is an open issue
    – Henrik
    Nov 9 at 14:13






  • 1




    Thank you Henrik for pointing that out. I guess I can safely ignore the warnings for now.
    – Roger Bos
    Nov 9 at 14:26














up vote
2
down vote

favorite












I want to sum some columns in a data.table, specifying those columns in a variable. I then use the .. prefix (see New Features data.table 1.10.2) to select those columns. However, this results in a Warning:



mdt <- as.data.table(mtcars)
factorsGEN <- c("disp","hp","drat")
# This works but gives the warning below
mdt[ , score := rowSums(mdt[ , ..factorsGEN])]
#Warning message:
# In `[.data.table`(mdt, , ..factorsGEN) :
# Both 'factorsGEN' and '..factorsGEN' exist in calling scope. Please remove 
# the '..factorsGEN' variable in calling scope for clarity.

# This does not work, results in error because factorsGEN is not found
mdt[, score := rowSums(mdt[, factorsGEN])]


I get a warning, which I don't remember getting when I first wrote the code, so it may be the result of an update to the data.table code. Could anyone please tell me how to avoid the warning. I can't figure it out.






r data.table







share|improve this question



















  • 1




    This is an open issue
    – Henrik
    Nov 9 at 14:13






  • 1




    Thank you Henrik for pointing that out. I guess I can safely ignore the warnings for now.
    – Roger Bos
    Nov 9 at 14:26












up vote
2
down vote

favorite









up vote
2
down vote

favorite











I want to sum some columns in a data.table, specifying those columns in a variable. I then use the .. prefix (see New Features data.table 1.10.2) to select those columns. However, this results in a Warning:



mdt <- as.data.table(mtcars)
factorsGEN <- c("disp","hp","drat")
# This works but gives the warning below
mdt[ , score := rowSums(mdt[ , ..factorsGEN])]
#Warning message:
# In `[.data.table`(mdt, , ..factorsGEN) :
# Both 'factorsGEN' and '..factorsGEN' exist in calling scope. Please remove 
# the '..factorsGEN' variable in calling scope for clarity.

# This does not work, results in error because factorsGEN is not found
mdt[, score := rowSums(mdt[, factorsGEN])]


I get a warning, which I don't remember getting when I first wrote the code, so it may be the result of an update to the data.table code. Could anyone please tell me how to avoid the warning. I can't figure it out.






r data.table







share|improve this question















I want to sum some columns in a data.table, specifying those columns in a variable. I then use the .. prefix (see New Features data.table 1.10.2) to select those columns. However, this results in a Warning:



mdt <- as.data.table(mtcars)
factorsGEN <- c("disp","hp","drat")
# This works but gives the warning below
mdt[ , score := rowSums(mdt[ , ..factorsGEN])]
#Warning message:
# In `[.data.table`(mdt, , ..factorsGEN) :
# Both 'factorsGEN' and '..factorsGEN' exist in calling scope. Please remove 
# the '..factorsGEN' variable in calling scope for clarity.

# This does not work, results in error because factorsGEN is not found
mdt[, score := rowSums(mdt[, factorsGEN])]


I get a warning, which I don't remember getting when I first wrote the code, so it may be the result of an update to the data.table code. Could anyone please tell me how to avoid the warning. I can't figure it out.






r data.table




r data.table






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 11 at 18:11









Henrik

40.5k991107




40.5k991107










asked Nov 9 at 14:04









Roger Bos

384




384







  • 1




    This is an open issue
    – Henrik
    Nov 9 at 14:13






  • 1




    Thank you Henrik for pointing that out. I guess I can safely ignore the warnings for now.
    – Roger Bos
    Nov 9 at 14:26












  • 1




    This is an open issue
    – Henrik
    Nov 9 at 14:13






  • 1




    Thank you Henrik for pointing that out. I guess I can safely ignore the warnings for now.
    – Roger Bos
    Nov 9 at 14:26







1




1




This is an open issue
– Henrik
Nov 9 at 14:13




This is an open issue
– Henrik
Nov 9 at 14:13




1




1




Thank you Henrik for pointing that out. I guess I can safely ignore the warnings for now.
– Roger Bos
Nov 9 at 14:26




Thank you Henrik for pointing that out. I guess I can safely ignore the warnings for now.
– Roger Bos
Nov 9 at 14:26

















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