[R] Odp: Letters(V1,V2..) as row col indices instead of numbers

[Petr PIKAL]

Hi

r-help-bounces at r-project.org napsal dne 28.01.2011 09:52:05:

> 
> What makes matrix to print V1, V2 as the row and col indices instead of
> numbers??
> 
> cdata = read.table("ramesh.txt") #cdata is read from a file.
> c1 = cor(cdata) 
> 
> I am printing c1 below. I need only numbers. I dont need V1, V2...what
> should I do in this case??
> http://r.789695.n4.nabble.com/file/n3243980/ramesh.txt ramesh.txt 
> 
>            V1        V2        V3        V4        V5        V6 V7
> V1  1.0000000 0.9471591 0.9191233 0.9403129 0.9689690 0.9621362 
0.9529811
> V2  0.9471591 1.0000000 0.8888108 0.9108174 0.9703906 0.9425248 
0.9294308
> V3  0.9191233 0.8888108 1.0000000 0.8788107 0.9077245 0.9078971 
0.8965331
> V4  0.9403129 0.9108174 0.8788107 1.0000000 0.9477058 0.9017977 
0.8646251
> V5  0.9689690 0.9703906 0.9077245 0.9477058 1.0000000 0.9531459 
0.9162016
> V6  0.9621362 0.9425248 0.9078971 0.9017977 0.9531459 1.0000000 
0.9447130
> V7  0.9529811 0.9294308 0.8965331 0.8646251 0.9162016 0.9447130 
1.0000000
> V8  0.9167526 0.9395067 0.8491496 0.8942693 0.9460702 0.9304229 
0.8505287
> V9  0.9512951 0.9598302 0.8666839 0.9465725 0.9645178 0.9486105 
0.8979753
> V10 0.9551633 0.9040160 0.9180022 0.9429816 0.9448644 0.9220875 
0.9075537

Vn are names of columns which R gave to your matrix when you read it as a 
data frame. And cor just makes a matrix of pairwise corelation 
coefficients from this data frame conveniently named from this data frame. 
If you do not want those names just unname it.

c1 = unname(cor(cdata))

But I wonder why you dislike those names which are,  well, just names.

Regards
Petr


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