Mercurial > matrix-functions
view toolbox/sub.m @ 2:c124219d7bfa draft
Re-add the 1995 toolbox after noticing the statement in the ~higham/mctoolbox/ webpage.
author | Antonio Pino Robles <data.script93@gmail.com> |
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date | Thu, 07 May 2015 18:36:24 +0200 |
parents | 8f23314345f4 |
children |
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function S = sub(A, i, j) %SUB Principal submatrix. % SUB(A,i,j) is A(i:j,i:j). % SUB(A,i) is the leading principal submatrix of order i, % A(1:i,1:i), if i>0, and the trailing principal submatrix % of order ABS(i) if i<0. if nargin == 2 if i >= 0 S = A(1:i, 1:i); else n = min(size(A)); S = A(n+i+1:n, n+i+1:n); end else S = A(i:j, i:j); end