Re: [R] Testing if all elements are equal in a vector/matrix
Hi library(magic) ?minmax [ the basic idea is min(x) == max(x) ] best wishes Robin On 29 Aug 2005, at 20:35, Vincent Goulet wrote: Is there a canonical way to check if all elements of a vector or matrix are the same? Solutions below work, but look hackish to me. x - rep(1, 10) all(x == x[1]) # == operator does not provide for small differences [1] TRUE isTRUE(all.equal(x, rep(x[1], length(x # ugly [1] TRUE Best, Vincent -- Vincent Goulet, Associate Professor École d'actuariat Université Laval, Québec [EMAIL PROTECTED] http://vgoulet.act.ulaval.ca __ 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 -- Robin Hankin Uncertainty Analyst National Oceanography Centre, Southampton European Way, Southampton SO14 3ZH, UK tel 023-8059-7743 __ 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
[R] Testing if all elements are equal in a vector/matrix
Is there a canonical way to check if all elements of a vector or matrix are the same? Solutions below work, but look hackish to me. x - rep(1, 10) all(x == x[1]) # == operator does not provide for small differences [1] TRUE isTRUE(all.equal(x, rep(x[1], length(x # ugly [1] TRUE Best, Vincent -- Vincent Goulet, Associate Professor École d'actuariat Université Laval, Québec [EMAIL PROTECTED] http://vgoulet.act.ulaval.ca __ 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
Re: [R] Testing if all elements are equal in a vector/matrix
See ?identical -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Vincent Goulet Sent: Monday, August 29, 2005 3:35 PM To: r-help@stat.math.ethz.ch Subject: [R] Testing if all elements are equal in a vector/matrix Is there a canonical way to check if all elements of a vector or matrix are the same? Solutions below work, but look hackish to me. x - rep(1, 10) all(x == x[1]) # == operator does not provide for small differences [1] TRUE isTRUE(all.equal(x, rep(x[1], length(x # ugly [1] TRUE Best, Vincent -- Vincent Goulet, Associate Professor École d'actuariat Université Laval, Québec [EMAIL PROTECTED] http://vgoulet.act.ulaval.ca __ 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 __ 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
Re: [R] Testing if all elements are equal in a vector/matrix
Hi Doran The documentation for isTRUE reads 'isTRUE(x)' is an abbreviation of 'identical(TRUE,x)' so actually Vincent's solutions is cleaner than using identical :) Cheers Francisco From: Doran, Harold [EMAIL PROTECTED] To: [EMAIL PROTECTED], r-help@stat.math.ethz.ch Subject: Re: [R] Testing if all elements are equal in a vector/matrix Date: Mon, 29 Aug 2005 15:49:20 -0400 See ?identical -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Vincent Goulet Sent: Monday, August 29, 2005 3:35 PM To: r-help@stat.math.ethz.ch Subject: [R] Testing if all elements are equal in a vector/matrix Is there a canonical way to check if all elements of a vector or matrix are the same? Solutions below work, but look hackish to me. x - rep(1, 10) all(x == x[1]) # == operator does not provide for small differences [1] TRUE isTRUE(all.equal(x, rep(x[1], length(x # ugly [1] TRUE Best, Vincent -- Vincent Goulet, Associate Professor École d'actuariat Université Laval, Québec [EMAIL PROTECTED] http://vgoulet.act.ulaval.ca __ 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 __ 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 __ 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
Re: [R] Testing if all elements are equal in a vector/matrix
How about diff(range(x)) tolerance Patrick Burns [EMAIL PROTECTED] +44 (0)20 8525 0696 http://www.burns-stat.com (home of S Poetry and A Guide for the Unwilling S User) Vincent Goulet wrote: Is there a canonical way to check if all elements of a vector or matrix are the same? Solutions below work, but look hackish to me. x - rep(1, 10) all(x == x[1]) # == operator does not provide for small differences [1] TRUE isTRUE(all.equal(x, rep(x[1], length(x # ugly [1] TRUE Best, Vincent __ 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
Re: [R] Testing if all elements are equal in a vector/matrix
or perhaps length(unique(x))==1 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Patrick Burns Sent: Monday, August 29, 2005 5:22 PM To: [EMAIL PROTECTED] Cc: r-help@stat.math.ethz.ch Subject: Re: [R] Testing if all elements are equal in a vector/matrix How about diff(range(x)) tolerance Patrick Burns [EMAIL PROTECTED] +44 (0)20 8525 0696 http://www.burns-stat.com (home of S Poetry and A Guide for the Unwilling S User) Vincent Goulet wrote: Is there a canonical way to check if all elements of a vector or matrix are the same? Solutions below work, but look hackish to me. x - rep(1, 10) all(x == x[1]) # == operator does not provide for small differences [1] TRUE isTRUE(all.equal(x, rep(x[1], length(x # ugly [1] TRUE Best, Vincent __ 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 __ 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
Re: [R] Testing if all elements are equal in a vector/matrix
I like this one! It however has the same drawback as any(x == x[1]) Patrick Burn's suggestion is also quite nice and original and allows for some fuzzyness, like all.equal() does. I will conclude from this thread that there is no canonical way to do the test I want, but many different approaches (something frequent in R). Thanks all for the suggestions! Le 29 Août 2005 17:45, vous avez écrit : or perhaps length(unique(x))==1 -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Patrick Burns Sent: Monday, August 29, 2005 5:22 PM To: [EMAIL PROTECTED] Cc: r-help@stat.math.ethz.ch Subject: Re: [R] Testing if all elements are equal in a vector/matrix How about diff(range(x)) tolerance Patrick Burns [EMAIL PROTECTED] +44 (0)20 8525 0696 http://www.burns-stat.com (home of S Poetry and A Guide for the Unwilling S User) Vincent Goulet wrote: Is there a canonical way to check if all elements of a vector or matrix are the same? Solutions below work, but look hackish to me. x - rep(1, 10) all(x == x[1]) # == operator does not provide for small differences [1] TRUE isTRUE(all.equal(x, rep(x[1], length(x # ugly [1] TRUE Best, Vincent __ 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 -- Vincent Goulet, Professeur agrégé École d'actuariat Université Laval, Québec [EMAIL PROTECTED] http://vgoulet.act.ulaval.ca __ 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
