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/* Assorted matrix functions written for ELIZC by JPG */
/* Examples: Let M be a 4x4 matrix.
SEL(M,[1,3],[2,4]); gives MATRIX([M12,M14],[M32,M34]).
	SEL is short for SELECT.
ROWS(M,[1,3]); gives MATRIX([M11,M12,M13,M14],[M31,M32,M33,M34]).
COLS(M,[1,3]); gives MATRIX([M11,M13],[M21,M23],[M31,M33],[M41,M43]). */

sel(m,r,c):=block([subscrmap:true],apply('matrix,ev(m[r,c],eval)))$ 
rows(m,r):=apply('matrix,makelist(m[i],i,r))$ 
cols(m,c):=transpose(rows(transpose(m),c))$