export R output to .txt file

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You can use the sink() function in R. It will divert all R console output between the first and second call of sink() to a file that you specify. Here is an example using a linear model fitted to the iris data set.

fit <- lm(Petal.Length ~ Sepal.Length, data = iris)

sink(file = "lm_output.txt")
summary(fit)
sink(file = NULL)

This will create a file lm_output.txt in your working directory containing the output of summary(fit).

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