R help - Nov 2010 - is this matrix symmetric

Hi,

I have this symmetric matrix, at least I think so.

     col1  col2  col3
[1,] 0.20 0.05 0.06
[2,] 0.05 0.10 0.03
[3,] 0.06 0.03 0.08

or

structure(c(0.2, 0.05, 0.06, 0.05, 0.1, 0.03, 0.06, 0.03, 0.08
), .Dim = c(3L, 3L), .Dimnames = list(NULL, c("var1",
"var2",
"var3")))

But isSymmetric() doesn't agree. Any comment? I am on R 2.10.1 Thanks.

Jun

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Jun Shen wrote:
> Hi,
> 
> I have this symmetric matrix, at least I think so.
> 
>      col1  col2  col3
> [1,] 0.20 0.05 0.06
> [2,] 0.05 0.10 0.03
> [3,] 0.06 0.03 0.08
> 
> or
> 
> structure(c(0.2, 0.05, 0.06, 0.05, 0.1, 0.03, 0.06, 0.03, 0.08
> ), .Dim = c(3L, 3L), .Dimnames = list(NULL, c("var1",
"var2",
> "var3")))
> 
> But isSymmetric() doesn't agree. Any comment? I am on R 2.10.1 Thanks.
> 
> Jun
> 
Did you check the help page? See under Details about
rownames and colnames.

   -Peter Ehlers

Hi Jun,

Just remove the col.names:

colnames(x) <- NULL
isSymmetric(x)
[1] TRUE

HTH,
Jorge


On Sun, Nov 7, 2010 at 1:21 AM, Jun Shen <> wrote:
> Hi,
>
> I have this symmetric matrix, at least I think so.
>
>     col1  col2  col3
> [1,] 0.20 0.05 0.06
> [2,] 0.05 0.10 0.03
> [3,] 0.06 0.03 0.08
>
> or
>
> structure(c(0.2, 0.05, 0.06, 0.05, 0.1, 0.03, 0.06, 0.03, 0.08
> ), .Dim = c(3L, 3L), .Dimnames = list(NULL, c("var1",
"var2",
> "var3")))
>
> But isSymmetric() doesn't agree. Any comment? I am on R 2.10.1 Thanks.
>
> Jun
>
>        [[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.
>
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