Message-ID: <1352652483.87743.YahooMailNeo@web142604.mail.bf1.yahoo.com>
Date: 2012-11-11T16:48:03Z
From: arun
Subject: changing the signs in rows or columns in matrices and check them if they are identical
In-Reply-To: <509F864B.90908@sapo.pt>
Hi,
I guess this should also work for the last two pairs of matrices:
fun3<-function(x,y){
?res<-all(Reduce(paste,data.frame(x))==Reduce(paste,data.frame(y))|Reduce(paste,data.frame(x))==Reduce(paste,-1*data.frame(y)))
?res}
?fun3(x1,y1)
#[1] TRUE
?fun3(x2,y2)
#[1] FALSE
fun4<-function(x,y){
?res<-all(Reduce(paste,data.frame(t(x)))==Reduce(paste,data.frame(t(y)))|Reduce(paste,data.frame(t(x)))==Reduce(paste,-1*data.frame(t(y))))
?res}
fun4(x1,y1)
#[1] FALSE
?fun4(x2,y2)
#[1] TRUE
A.K.
----- Original Message -----
From: Rui Barradas <ruipbarradas at sapo.pt>
To: Haris Rhrlp <haris_r_help at yahoo.com>
Cc: "R-help at r-project.org" <R-help at r-project.org>
Sent: Sunday, November 11, 2012 6:04 AM
Subject: Re: [R] changing the signs in rows or columns in matrices and check them if they are identical
Hello,
Thanks for the data examples. But you should give them in a form that's
easy for us to copy and paste into an R session. Using ?dput, for
instance. The examples below are the last two pairs of matrices in your
post, the ones with different signs. fun1() checks rows and fun2() columns.
x1 <- structure(c(1, -1, 1, -1, 1, 1, 1, -1, -1), .Dim = c(3L, 3L))
y1 <- structure(c(1, -1, -1, -1, 1, -1, 1, -1, 1), .Dim = c(3L, 3L))
x2 <- structure(c(1, -1, 1, -1, 1, 1, 1, -1, -1), .Dim = c(3L, 3L))
y2 <- structure(c(1, -1, 1, 1, -1, -1, 1, -1, -1), .Dim = c(3L, 3L))
fun1 <- function(x, y){
? ? all(sapply(seq_len(nrow(x)), function(i)
? ? ? ? identical(x[i,], y[i,]) || identical(x[i,], -y[i,])))
}
fun2 <- function(x, y){
? ? all(sapply(seq_len(nrow(x)), function(i)
? ? ? ? identical(x[,i], y[,i]) || identical(x[,i], -y[,i])))
}
fun1(x1, y1)? # TRUE
fun2(x1, y1)? # FALSE
fun1(x2, y2)? # FALSE
fun2(x2, y2)? # TRUE
Hope this helps,
Rui Barradas
Em 11-11-2012 08:06, Haris Rhrlp escreveu:
> Dear R users,
>
> i have this problem with matrices i want to check between two matrices if they are isomorphic i will give an example for what excactly i want
>? ? 1 -1? 1? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? -1? 1? 1
> -1? 1? -1? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 1? -1? -1
>? ? 1? 1? -1? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 1? 1? -1
> this two matrices are isomorphic beacause if i change the first 2 columns the matrices are identical
>
>? ? 1? -1? 1? ? ? ? ? ? ? ? ? ? ? ? ? ? -1? ? 1? -1
>? -1? ? 1 -1? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 1? -1? 1
>? ? 1? ? 1? -1? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 1? -1? 1
> this two matrices are isomorphic because if i change the first 2 rows the matrices? are identical
>? 1? ? -1? 1? ? ? ? ? ? ? ? ? ? ? ? 1? ? -1? 1
> -1? ? ? 1? -1? ? ? ? ? ? ? ? ? ? ? ? -1? ? 1? -1
>? ? 1? ? ? 1? -1? ? ? ? ? ? ? ? ? ? ? ? -1? -1? 1
> this two matrices are isomorphic because in the third line if i change the signs the two matrices are identical
>? ? 1? -1? 1? ? ? ? ? ? ? ? ? ? ? 1? ? 1? ? 1
> -1? ? 1? -1? ? ? ? ? ? ? ? ? ? -1? -1? -1
>? 1? ? 1? -1? ? ? ? ? ? ? ? ? ? ? 1? -1? -1
> this two matrices are isomorphic because in the second column if i change the signs the two matrices are identical
>
>
> and all the above together
>
> rA <- apply(BB2[,,1,(j-1)],1,paste,collapse=" ")
>? ? ? rB <- apply(BB2[,,i,(j-1)],1,paste,collapse=" ")
>? ? ? cA <- apply(BB2[,,1,(j-1)],2,paste,collapse=" ")
>? ? ? cB <- apply(BB2[,,i,(j-1)],2,paste,collapse=" ")
>? ? ? iso <- all(sort(rA) == sort(rB)) | all(sort(cA) == sort(cB))
>
> this is only for? the change or rows and columns but i want to change the signs too.
>
> ??? [[alternative HTML version deleted]]
>
>
>
> ______________________________________________
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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
> and provide commented, minimal, self-contained, reproducible code.
??? [[alternative HTML version deleted]]
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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.