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why the a[-indx] does not work?

Sun, Oct 30, 2011 1:57 PM

I like to use numericVector != 0 instead of
is.logical(numericVector) because the former
more directly indicates what you want to happen
instead of relying on knowledge that numeric 0
maps to logical FALSE.

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com

________________________________
From: andrija djurovic <djandrija at gmail.com>

Cc: "R-help at r-project.org" <R-help at r-project.org>
Sent: Sunday, October 30, 2011 9:58 PM
Subject: Re: [R] why the a[-indx] does not work?

as.logical(c(1,0,1,1))
[1] ?TRUE FALSE ?TRUE ?TRUE

?as.logical

probably you mean

For ?[?-indexing only: ?i?, ?j?, ?...? can be logical
vectors, indicating elements/slices to select. ?Such vectors
are recycled if necessary to match the corresponding extent.
?i?, ?j?, ?...? can also be negative integers, indicating
elements/slices to leave out of the selection.

How can i convert the positives to TRUE and zeros and FALSE?

________________________________
From: William Dunlap <wdunlap at tibco.com>

Sent: Sunday, October 30, 2011 9:17 PM
Subject: RE: [R] why the a[-indx] does not work?

? > a[overLoadTesT==0]
? [1]? 2? 4? 5? 6? 7? 8? 9 10
Look into help('[') or help('Subscript') to see
how integer and logical (Boolean) subscripts differ.

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Alaios
Sent: Sunday, October 30, 2011 11:52 AM
To: R-help at r-project.org
Subject: [R] why the a[-indx] does not work?

Dear all,

Could you please explain me why

OverloadsTesT
[1] 1 0 1 0 0 0 0 0 0 0
a<-matrix(data=seq(1,10),nrow=10)
a
[,1]
[1,]? ? 1
[2,]? ? 2
[3,]? ? 3
[4,]? ? 4
[5,]? ? 5
[6,]? ? 6
[7,]? ? 7
[8,]? ? 8
[9,]? ? 9
[10,]? ?10
a[-OverloadsTesT]
[1]? 2? 3? 4? 5? 6? 7? 8? 9 10

the last line does not remove the first and third element and only does the first element.?

What I want to do is for zeros to return the elements and for any positive value to remove it.
What I am doing wrong?

B.R
Alex
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

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Thread (12 messages)

Alaios why the a[-indx] does not work? Oct 30 Duncan Murdoch why the a[-indx] does not work? Oct 30 William Dunlap why the a[-indx] does not work? Oct 30 David Winsemius why the a[-indx] does not work? Oct 30 Alaios why the a[-indx] does not work? Oct 30 Sarah Goslee why the a[-indx] does not work? Oct 30 andrija djurovic why the a[-indx] does not work? Oct 30 Alaios why the a[-indx] does not work? Oct 30 William Dunlap why the a[-indx] does not work? Oct 30 William Dunlap why the a[-indx] does not work? Oct 30 andrija djurovic why the a[-indx] does not work? Oct 30 Alaios why the a[-indx] does not work? Oct 30