| [ KAIST ] in KIDS 글 쓴 이(By): iLUSiON (화려한집념) 날 짜 (Date): 2003년 5월 13일 화요일 오전 02시 14분 26초 제 목(Title): Re: [Q]이 행렬 이름은? def: idempotent matrix of period(order) k is A^k=A. If we denote J as the matrix the original poster introduced, J^3=J. In many textbooks, such matrices are denoted by J in relation to I since J^2=I. Also since JJ'=I, it is a permutation (or projection) matrix which will permute the postion of matrix elements. So JM or MJ will permuate the psotion of the element of M ,this fact is extreamly useful in MATLAMprogramming. :) iLUSiON whitepolarcow@hotmail.com |