Conversion of symmetry matrix into a vector ONE MORE QUESTION

Dear Michael,
Thank you very much.
That what i exactly want.

One more question:
Do you know some code that convert a symmetric matrix into a
lower-triangular matrix (not vector) ?
I tried with function "lower.tri" and "lower" (from ecodist package), but
they don't give lower-triangular value in the form of matrix, it gives in
the form of vector.
The function "dist" you used here, is not suitable to calculate correlation.

To be more clear, i want to calculate correlation first, which give a
symmetric matrix. Now i want to convert it into a "lower-triangular
correlation matrix".
If there is some way available or some function in R, it will be very nice.
Thank you very much.
Wish you good time.
Thanks

Regards,
Ram Kumar Basnet.
Ph. D. student

From: R. Michael Weylandt <michael.weylandt at gmail.com>
To: ram basnet <basnetabc at yahoo.com>
Cc: R help <r-help at r-project.org>
Sent: Wednesday, November 16, 2011 5:26 AM
Subject: Re: [R] Conversion of symmetry matrix into a vector

Try something like this:

X = matrix(rnorm(25), 5); colnames(X) <- rownames(X) <- letters[1:5]

Y <- dist(X)

library(reshape)
melt(as.matrix(Y))

Michael

On Tue, Nov 15, 2011 at 7:03 PM, ram basnet <basnetabc at yahoo.com> wrote:

Dear R users,

I am not good in R-language programming. So, i need your help.

I want to convert my lower-triangle value of symmetry matrix into a vector
with their row and column name.
I found a function called "sm2vec" in "corpcor" package but it give only a
vector of values but not row and column names. But i also want ROW and
COLUMN name together with their corresponding values.

To make more clear,
For example: Suppose i have a symmetric matrix with lower-triangle value
with 5 variables (eg. a - e). But in real, i have many variables.

? a b c d e
a ?- - - - -
b -0.44145 ?- - - ?-
c -0.67922 0.232548 ?- - ?-
d 0.114012 0.186583 0.244655 ?- ?-
e -0.031 -0.35098 -0.16327 -0.34573 ?-

Now, I want to convert above table into the following format. So, if some
one can tell what kind of R code does this, it will be great help.

row name column name value
b a -0.44145
c a -0.67922
d a 0.114012
e a -0.031
c b 0.232548
d b 0.186583
e b -0.35098
d c 0.244655
e c -0.16327
e d -0.34573

If some one can help me, it will be great for me.

Thanks in advance for your help.

Regards,
Ram Kumar Basnet
Ph. D. student.
? ? ? ?[[alternative HTML version deleted]]