How would it be possible in the example below to skip the step of writing to file "test.txt", ie assign the cat-result to an object, and still achieve the same end result?
I thought I'd include the full example to give background to my problem.
test <- c("V 1", "x", "1 2 3", "y", "3 5 8", "V 2", "x", "y", "V 3", "y", "7 2 1", "V 4", "x", "9 3 7", "y")
# Write selection to file
cat(test, "\n", file="test.txt")
test2 <- readLines("test.txt")
test3 <- strsplit(test2, "V ")[[1]][-1]
# Find results
x <- gsub("([0-9]) (?:x )?([0-9] [0-9] [0-9])?.*", "\\1 \\2 ", test3, perl = TRUE)
y <- gsub("([0-9]).* y ?([0-9] [0-9] [0-9])?.*", "\\1 \\2 ", test3, perl = TRUE)
# Eliminate tests with no results
x1 <- x[regexpr("[0-9] ([^0-9]).*", x) == -1]
y1 <- y[regexpr("[0-9] ([^0-9]).*", y) == -1]
# Dataframe of results
xdf1 <- read.table(textConnection(x1), col.names=c("id","x1","x2","x3"))
ydf1 <- read.table(textConnection(y1), col.names=c("id","y1","y2","y3"))
closeAllConnections()
# Dataframe of tests with no results
x2 <- x[regexpr("[0-9] ([^0-9]).*", x) == 1]
y2 <- y[regexpr("[0-9] ([^0-9]).*", y) == 1]
df1 <- as.integer(x2[x2 == y2])
df1 <- data.frame(id = df1)
# Merge dataframes
results <- merge(xdf1, ydf1, all = TRUE)
results <- merge(results, df1, all = TRUE)
results
Results in:
id x1 x2 x3 y1 y2 y3
1 1 1 2 3 3 5 8
2 2 NA NA NA NA NA NA
3 3 NA NA NA 7 2 1
4 4 9 3 7 NA NA NA
As a more general solution, you can use the capture output function. It results in a character vector with elements corresponding to each line of the output.
your example:
test2<-capture.output(cat(test))
here is a multi-line example:
> out<-capture.output(summary(lm(hwy~cyl*drv,data=mpg)))
> out
[1] ""
[2] "Call:"
[3] "lm(formula = hwy ~ cyl * drv, data = mpg)"
[4] ""
[5] "Residuals:"
[6] " Min 1Q Median 3Q Max "
[7] "-8.3315 -1.4139 -0.1382 1.6479 13.5861 "
[8] ""
[9] "Coefficients:"
[10] " Estimate Std. Error t value Pr(>|t|) "
[11] "(Intercept) 32.1776 1.2410 25.930 < 2e-16 ***"
[12] "cyl -2.0049 0.1859 -10.788 < 2e-16 ***"
[13] "drvf 8.4009 1.8965 4.430 1.47e-05 ***"
[14] "drvr 8.2509 6.4243 1.284 0.200 "
[15] "cyl:drvf -0.5362 0.3422 -1.567 0.119 "
[16] "cyl:drvr -0.5248 0.8379 -0.626 0.532 "
[17] "---"
[18] "Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1 "
[19] ""
[20] "Residual standard error: 2.995 on 228 degrees of freedom"
[21] "Multiple R-squared: 0.7524,\tAdjusted R-squared: 0.747 "
[22] "F-statistic: 138.6 on 5 and 228 DF, p-value: < 2.2e-16 "
[23] ""
Instead of cat
ing to a file, why not use the paste
command to generate a string instead?
> paste(test, collapse="\n")
[1] "V 1\nx\n1 2 3\ny\n3 5 8\nV 2\nx\ny\nV 3\ny\n7 2 1\nV 4\nx\n9 3 7\ny"
Now instead of doing a cat
then readlines
you can just pass this string directly into strsplit
.
Try
> f <- textConnection("test3", "w")
> cat(test, "\n", file=f)
> test3
[1] "V 1 x 1 2 3 y 3 5 8 V 2 x y V 3 y 7 2 1 V 4 x 9 3 7 y "
> close(f)
There's also the assign statement which allows you to build a name and set an object to it. Very useful if you want to iterate a bunch of tests and name them with dynamic values.
assign("mary", paste(test,sep= "\\n"))
will assign the paste statement to mary. However say you were running a bunch of regressions and wanted your regression objects named by predictor. You could do something like
assign(paste("myRegression",names(dataframe)[2],sep=""), lm(dataframe$response~dataframe[,2]))
which would give you the object
myRegressionPredictorName as you linear model.
Try the following codes:
writeLines(capture.out((summary(lm(hwy~cyl*drv,data=mpg)),con="summary.txt",sep="\\n")
Then you can open the txt file "summary.txt" to see your results.
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