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• R로 symmetric한 positive definite matrix를 만들어 보자. {출처 : https://vserver1.cscs.lsa.umich.edu/~crshalizi/sloth/g-post-code.R} =========================== require(MASS) # Needed to generate multivariate random normals require(stats) # For factor analysis; blog.naver.com · 2014.12.12