Save output from loop to text file in R

Question

Im trying to loop through a data frame to produce a text file with a specific format. Here is an example data frame:

x <- 1:10
y <- 10:1

df <- data.frame(x,y)

This loop will print text in the format I want it:

for (n in 1 : length(df[,1]))
{
  cat(paste("\n-insertblock weld\n", df[n,1], df[n,2], "\n1\n1\n0", sep = " "))
}

I would now like to do two things: 1) add the print to a txt file 2) add some more text to the top (will be the same for every file i produce). I have found this question which shows how to write txt to a file: Write lines of text to a file in R And this one (how to write to files with writeLines in R) tells me that writeLines needs things to be as.character. This is my attempt:

fileConn <- file("output.txt")
for (n in 1 : length(df[,1]))
{
  writeLines(cat(paste("\n-insertblock weld\n", as.character(df[n,1])), as.character(df[n,2]), "\n1\n1\n0", sep = " "), fileConn)
}
close(fileConn)

However, this gives an error:

Error in writeLines(cat(paste("\n-insertblock weld\n", as.character(df[n, : invalid 'text' argument

If I remove cat the error goes away but I only get the last line of the output:

for (n in 1 : length(df[,1]))
{
  writeLines(paste("\n-insertblock weld\n", as.character(df[n,1]), as.character(df[n,2]), "\n1\n1\n0", sep = " "), fileConn)
}
close(fileConn)

-insertblock weld
 10 1 
1
1
0

After I have created the correct txt file I need to add this to the top:

--simplenote
J
C
-36.413,33.568
5
0

Am i barking up the wrong tree with my method for saving the pasted text? Any help appreciated

Alexey Ferapontov · Accepted Answer · 2015-07-23 13:05:37Z

2

sink("count.txt",split=FALSE,append = FALSE)

cat(paste("--simplenote\n","J\n","C\n","-36.413,33.568\n","5\n","0\n", sep = " "))

for (n in 1 : length(df[,1]))
{
  cat(paste("\n-insertblock weld\n", df[n,1], df[n,2], "\n1\n1\n0", sep = " "))
}

answered Jul 23, 2015 at 13:05

Alexey Ferapontov

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