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st: RE: creat the matrix based on the condition
From
Joe Canner <[email protected]>
To
"[email protected]" <[email protected]>
Subject
st: RE: creat the matrix based on the condition
Date
Fri, 11 Apr 2014 14:19:05 +0000
Wanhaiyou,
Here is a brute force way to do this. Perhaps someone else has a more clever way.
***CODE***
mat A=J(3,6,0)
forvalues i=1/3 {
forvalues j=1/3 {
if (!mi(v`j'[`i'])) {
mat A[`i',v`j'[`i']]=1
}
}
}
matrix list A
***END****
I assume you want to generalize this for larger data sets (otherwise you could just create the matrix manually), which can easily be done with the following modifications:
***CODE***
mat A=J(_N,6,0)
forvalues i=1/`=_N' {
forvalues j=1/3 {
if (!mi(v`j'[`i'])) {
mat A[`i',v`j'[`i']]=1
}
}
}
matrix list A
***END****
This can also be generalized for more variables and a higher maximum column dimension, but that will take more work.
Regards,
Joe Canner
Johns Hopkins University School of Medicine
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of wanhaiyou
Sent: Friday, April 11, 2014 3:41 AM
To: [email protected]
Subject: st: creat the matrix based on the condition
Dear Statalisters,
I have three variables in the dataset as following
clear
input v1 v2 v3
1 3 5
3 4 6
1 2 .
end
I want to creat the linkage matrix based on these variables.
The result is as following
1 0 1 0 1 0
0 0 1 1 0 1
1 1 0 0 0 0
The max number is 6, so the dimension of matrix is 3*6
Thanks for all suggestions.
Bests,
wanhaiyou
Hunan University
--
Bests,
wanhaiyou
Hunan University
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