[R] Incomplete ouput with sink and split=TRUE

From: jiho <jo.irisson_at_gmail.com>
Date: Tue, 5 Feb 2008 17:12:35 +0100


Dear List,

I am trying to get R's terminal output to a file and to the terminal at the same time, so that I can walk through some tests and keep a log concurrently. The function 'sink' with the option split=TRUE seems to do just that. It works fine for most output but for objects of class htest, the terminal output is incomplete (the lines are there but empty). Here is an example session which shows the problem:

> sink("textout.txt", type="output", split=T)
> b=bartlett.test(runif(10),c(1,1,1,1,2,2,2,2,2,2))
> class(b)

[1] "htest"
> b

data: runif(10) and c(1, 1, 1, 1, 2, 2, 2, 2, 2, 2)

> t=t.test(runif(10),c(1,1,1,1,2,2,2,2,2,2))
> t

data: runif(10) and c(1, 1, 1, 1, 2, 2, 2, 2, 2, 2) alternative hypothesis: true difference in means is not equal to 0 95 percent confidence interval:
  -1.5807338 -0.7316803
sample estimates:
mean of x mean of y
0.4437929 1.6000000

> sink() # output in the file is complete
> b

        Bartlett test of homogeneity of variances

data: runif(10) and c(1, 1, 1, 1, 2, 2, 2, 2, 2, 2) Bartlett's K-squared = 0.9959, df = 1, p-value = 0.3183

> t

        Welch Two Sample t-test

data: runif(10) and c(1, 1, 1, 1, 2, 2, 2, 2, 2, 2) t = -5.7659, df = 16.267, p-value = 2.712e-05 alternative hypothesis: true difference in means is not equal to 0 95 percent confidence interval:
  -1.5807338 -0.7316803
sample estimates:
mean of x mean of y
0.4437929 1.6000000

>

Is this a known bug (I'm using R 2.6.1 on OS X and Linux - FC8)? Is there an inherent reason why some portions of this output are not redirected?

Thank you in advance for your help.

JiHO

---
http://jo.irisson.free.fr/

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Received on Tue 05 Feb 2008 - 16:18:58 GMT

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