From: Peter Dalgaard <p.dalgaard_at_biostat.ku.dk>

Date: Fri 21 Oct 2005 - 00:20:10 EST

Date: Fri 21 Oct 2005 - 00:20:10 EST

"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"

-- O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk) FAX: (+45) 35327907 ______________________________________________ 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.htmlReceived on Fri Oct 21 00:54:17 2005

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