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Write multiple loaded variables into different .txt files

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3

I need to write multiple variables (dataframes) into different .txt files, named based it's original variables names. I tried use ls() function to select by pattern my desirable variables, but with no success. Is there any other approach to do this?

Using ls() function I was able to create .txt files with the correct filenames based on my variables (data1_tables.txt, data2_tables.txt, etc), but with the wrong output.

#create some variables based on mtcars data
data1 <- mtcars[1:5,]
data2 <- mtcars[6:10,]
data3 <- mtcars[11:20,]



fileNames=ls(pattern="data",all.names=TRUE)


for (i in fileNames) 
 write.table(i,paste(i,"_tables.txt",sep=""),row.names = T,sep="t",quote=F) 

I want that the created files (data1_tables.txt, data2_tables.txt, data3_tables.txt) have the output from the original data1, data2, data3 variables.

r

share|improve this question

asked Mar 27 at 19:34

ASFASF

8777 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Use get to reference object by string: write.table(get(i), paste(...
  
  – Parfait
  Mar 27 at 19:56
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  It's better not to create a much of objects with suffixes in their names. Things are much easier in R if you just collect all those objects in a named list. See this question for an example: stackoverflow.com/questions/17499013/…. Then you can list lapply() or whatever over the list.
  
  – MrFlick
  Mar 27 at 20:10
  

  
  
  
  

add a comment | 

3

I need to write multiple variables (dataframes) into different .txt files, named based it's original variables names. I tried use ls() function to select by pattern my desirable variables, but with no success. Is there any other approach to do this?

Using ls() function I was able to create .txt files with the correct filenames based on my variables (data1_tables.txt, data2_tables.txt, etc), but with the wrong output.

#create some variables based on mtcars data
data1 <- mtcars[1:5,]
data2 <- mtcars[6:10,]
data3 <- mtcars[11:20,]



fileNames=ls(pattern="data",all.names=TRUE)


for (i in fileNames) 
 write.table(i,paste(i,"_tables.txt",sep=""),row.names = T,sep="t",quote=F) 

I want that the created files (data1_tables.txt, data2_tables.txt, data3_tables.txt) have the output from the original data1, data2, data3 variables.

r

share|improve this question

asked Mar 27 at 19:34

ASFASF

8777 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Use get to reference object by string: write.table(get(i), paste(...
  
  – Parfait
  Mar 27 at 19:56
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  It's better not to create a much of objects with suffixes in their names. Things are much easier in R if you just collect all those objects in a named list. See this question for an example: stackoverflow.com/questions/17499013/…. Then you can list lapply() or whatever over the list.
  
  – MrFlick
  Mar 27 at 20:10
  

  
  
  
  

add a comment | 

I need to write multiple variables (dataframes) into different .txt files, named based it's original variables names. I tried use ls() function to select by pattern my desirable variables, but with no success. Is there any other approach to do this?

Using ls() function I was able to create .txt files with the correct filenames based on my variables (data1_tables.txt, data2_tables.txt, etc), but with the wrong output.

#create some variables based on mtcars data
data1 <- mtcars[1:5,]
data2 <- mtcars[6:10,]
data3 <- mtcars[11:20,]



fileNames=ls(pattern="data",all.names=TRUE)


for (i in fileNames) 
 write.table(i,paste(i,"_tables.txt",sep=""),row.names = T,sep="t",quote=F) 

I want that the created files (data1_tables.txt, data2_tables.txt, data3_tables.txt) have the output from the original data1, data2, data3 variables.

r

share|improve this question

asked Mar 27 at 19:34

ASFASF

8777 bronze badges

#create some variables based on mtcars data
data1 <- mtcars[1:5,]
data2 <- mtcars[6:10,]
data3 <- mtcars[11:20,]



fileNames=ls(pattern="data",all.names=TRUE)


for (i in fileNames) 
 write.table(i,paste(i,"_tables.txt",sep=""),row.names = T,sep="t",quote=F) 

share|improve this question

asked Mar 27 at 19:34

ASFASF

8777 bronze badges

share|improve this question

asked Mar 27 at 19:34

ASFASF

8777 bronze badges

asked Mar 27 at 19:34

ASFASF

8777 bronze badges

asked Mar 27 at 19:34

ASFASF

8777 bronze badges

2 Answers
2

active

oldest

votes

1

Change the end of your code to:

for (i in fileNames) 
write.table(eval(as.name(i)),paste(i,"_tables.txt",sep=""),row.names = T,sep="t",quote=F) 

share|improve this answer

answered Mar 27 at 19:42

Leo BrueggemanLeo Brueggeman

35311 silver badge44 bronze badges

add a comment | 

2

What is happenning is that, what you're actually writing to files are the elements from the fileNames vector (which are just strings). If you want to write any object to a file through the write functions, you need to input the object itself, not the name of the object.

#create some variables based on mtcars data
data1 <- mtcars[1:5,]
data2 <- mtcars[6:10,]
data3 <- mtcars[11:20,]

fileNames = ls(pattern="data", all.names=TRUE) 

for(i in fileNames) 

write.table(x=get(i), # The get function gets an object with a given name.
 file=paste0(i, "_tables.txt"), # paste0 is basically a paste with sep="" by default
 row.names=T, 
 sep="t", 
 quote=F) 

share|improve this answer

answered Mar 27 at 20:16

fran496fran496

8611 silver badge44 bronze badges

add a comment | 

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1

Change the end of your code to:

for (i in fileNames) 
write.table(eval(as.name(i)),paste(i,"_tables.txt",sep=""),row.names = T,sep="t",quote=F) 

share|improve this answer

answered Mar 27 at 19:42

Leo BrueggemanLeo Brueggeman

35311 silver badge44 bronze badges

add a comment | 

1

Change the end of your code to:

for (i in fileNames) 
write.table(eval(as.name(i)),paste(i,"_tables.txt",sep=""),row.names = T,sep="t",quote=F) 

share|improve this answer

answered Mar 27 at 19:42

Leo BrueggemanLeo Brueggeman

35311 silver badge44 bronze badges

add a comment | 

Change the end of your code to:

for (i in fileNames) 
write.table(eval(as.name(i)),paste(i,"_tables.txt",sep=""),row.names = T,sep="t",quote=F) 

share|improve this answer

answered Mar 27 at 19:42

Leo BrueggemanLeo Brueggeman

35311 silver badge44 bronze badges

for (i in fileNames) 
write.table(eval(as.name(i)),paste(i,"_tables.txt",sep=""),row.names = T,sep="t",quote=F) 

share|improve this answer

answered Mar 27 at 19:42

Leo BrueggemanLeo Brueggeman

35311 silver badge44 bronze badges

answered Mar 27 at 19:42

Leo BrueggemanLeo Brueggeman

35311 silver badge44 bronze badges

answered Mar 27 at 19:42

Leo BrueggemanLeo Brueggeman

35311 silver badge44 bronze badges

2

What is happenning is that, what you're actually writing to files are the elements from the fileNames vector (which are just strings). If you want to write any object to a file through the write functions, you need to input the object itself, not the name of the object.

#create some variables based on mtcars data
data1 <- mtcars[1:5,]
data2 <- mtcars[6:10,]
data3 <- mtcars[11:20,]

fileNames = ls(pattern="data", all.names=TRUE) 

for(i in fileNames) 

write.table(x=get(i), # The get function gets an object with a given name.
 file=paste0(i, "_tables.txt"), # paste0 is basically a paste with sep="" by default
 row.names=T, 
 sep="t", 
 quote=F) 

share|improve this answer

answered Mar 27 at 20:16

fran496fran496

8611 silver badge44 bronze badges

add a comment | 

2

What is happenning is that, what you're actually writing to files are the elements from the fileNames vector (which are just strings). If you want to write any object to a file through the write functions, you need to input the object itself, not the name of the object.

#create some variables based on mtcars data
data1 <- mtcars[1:5,]
data2 <- mtcars[6:10,]
data3 <- mtcars[11:20,]

fileNames = ls(pattern="data", all.names=TRUE) 

for(i in fileNames) 

write.table(x=get(i), # The get function gets an object with a given name.
 file=paste0(i, "_tables.txt"), # paste0 is basically a paste with sep="" by default
 row.names=T, 
 sep="t", 
 quote=F) 

share|improve this answer

answered Mar 27 at 20:16

fran496fran496

8611 silver badge44 bronze badges

add a comment | 

What is happenning is that, what you're actually writing to files are the elements from the fileNames vector (which are just strings). If you want to write any object to a file through the write functions, you need to input the object itself, not the name of the object.

#create some variables based on mtcars data
data1 <- mtcars[1:5,]
data2 <- mtcars[6:10,]
data3 <- mtcars[11:20,]

fileNames = ls(pattern="data", all.names=TRUE) 

for(i in fileNames) 

write.table(x=get(i), # The get function gets an object with a given name.
 file=paste0(i, "_tables.txt"), # paste0 is basically a paste with sep="" by default
 row.names=T, 
 sep="t", 
 quote=F) 

share|improve this answer

answered Mar 27 at 20:16

fran496fran496

8611 silver badge44 bronze badges

#create some variables based on mtcars data
data1 <- mtcars[1:5,]
data2 <- mtcars[6:10,]
data3 <- mtcars[11:20,]

fileNames = ls(pattern="data", all.names=TRUE) 

for(i in fileNames) 

write.table(x=get(i), # The get function gets an object with a given name.
 file=paste0(i, "_tables.txt"), # paste0 is basically a paste with sep="" by default
 row.names=T, 
 sep="t", 
 quote=F) 

share|improve this answer

answered Mar 27 at 20:16

fran496fran496

8611 silver badge44 bronze badges

answered Mar 27 at 20:16

fran496fran496

8611 silver badge44 bronze badges

answered Mar 27 at 20:16

fran496fran496

8611 silver badge44 bronze badges