From: Marc Schwartz (via MN) <mschwartz_at_mn.rr.com>

Date: Fri 21 Oct 2005 - 01:05:06 EST

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri Oct 21 02:18:24 2005

Date: Fri 21 Oct 2005 - 01:05:06 EST

On Thu, 2005-10-20 at 16:20 +0200, Peter Dalgaard wrote:

> "Nelson, Gary (FWE)" <Gary.Nelson@state.ma.us> writes:

*>
**> > Peter,
**> >
**> > Thank you for your response. I knew how close the values are to
**> > integers, but I still don't understand why I don't have control over
**> > how the numbers are displayed (rounded or not)?
**>
**> It's all in the conventions. The digits in print() and friends are
**> significant digits, so we first round to that many significant digits,
**> then discard trailing zeros, which is why
**>
**> > 12.500001
**> [1] 12.5
**> > 12.50001
**> [1] 12.50001
**>
**> The exception is that we do not discard significant digits to the left
**> of the decimal point, unless we are using scientific notation
**>
**> > print(12345678,digits=2)
**> [1] 1.2e+07
**> > print(12345678,digits=5)
**> [1] 12345678
**>
**> (the "scipen" options controls the logic for switching notation).
**>
**> For finer control we have the formatC function:
**>
**> > format(1234.00001,digits=9) # same thing as with print()
**> [1] "1234.00001"
**> > format(1234.00001,digits=8)
**> [1] "1234"
**> > formatC(1234.00001,digits=5,format="f")
**> [1] "1234.00001"
**> > formatC(1234.00001,digits=4,format="f")
**> [1] "1234.0000"
*

Also, sprintf():

> sprintf("%.9f", 1234.00001)

[1] "1234.000010000"

> sprintf("%.4f", 1234.00001)

[1] "1234.0000"

> sprintf("%12.4f", 1234.00001)

[1] " 1234.0000"

**HTH,
**
Marc Schwartz

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Fri Oct 21 02:18:24 2005

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