From: Duncan Murdoch <murdoch_at_stats.uwo.ca>

Date: Thu 26 Jan 2006 - 04:36:11 EST

*>
*

> Some functions that you might think create integer vectors and even

*> seem to say they create integer vectors dont create integer vectors:
*

*>
*

*> 'ceiling' takes a single numeric argument 'x' and returns a
*

*> numeric vector containing the smallest integers not less than the
*

*> corresponding elements of 'x'.
*

*>
*

*> > ceiling(0.5)
*

*> [1] 1
*

*>
*

*> > is.integer(ceiling(0.5))
*

*> [1] FALSE
*

*>
*

*> > is.integer(1:3)
*

*> [1] TRUE
*

*> > is.integer(ceiling(1:3))
*

*> [1] FALSE
*

*>
*

*>
*

*> This could possibly be a documentation problem, since ?ceiling is
*

*> using 'integer' in the sense of 'whole number', whereas ?is.integer is
*

*> concerned with internal representation (aka 'storage mode')....
*

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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Thu Jan 26 04:45:15 2006

Date: Thu 26 Jan 2006 - 04:36:11 EST

On 1/25/2006 10:57 AM, Barry Rowlingson wrote:

> Gabor Csardi wrote:

>> Becaues is.integer shows the internal representation, which is not an >> integer but a double (real number). Some functions create integer vectors,

> Some functions that you might think create integer vectors and even

Duncan Murdoch

*>
*

> This seems to be an endless source of confusion to anyone who didn't

*> start their programming days in Fortran, C, or assembly language (or
**> other strongly-typed language, I guess).
**>
**> Barry
**>
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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 Thu Jan 26 04:45:15 2006

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