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<TITLE> r = diag(matrix) or r=diag(vector)</TITLE>
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<H1><A NAME="SECTION005370000000000000000"> r = diag(matrix) or r=diag(vector)</A></H1>
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Given matrix return diagonal entries as a vector. Given vector return matrix
with diagonal elements from vector. r = diag(diag(a)) gives matrix with diagonal
elements from matrix a, otherwise elements are zero.
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<P><ADDRESS>
<I>Juha Ruokolainen <BR>
Fri Feb 14 15:59:30 EET 1997</I>
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