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comparison toolbox/dingdong.m @ 2:c124219d7bfa draft

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Re-add the 1995 toolbox after noticing the statement in the ~higham/mctoolbox/ webpage.
author Antonio Pino Robles <data.script93@gmail.com>
date Thu, 07 May 2015 18:36:24 +0200
parents 8f23314345f4
children
comparison
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1:e471a92d17be 2:c124219d7bfa
1 function A = dingdong(n)
2 %DINGDONG Dingdong matrix - a symmetric Hankel matrix.
3 % A = DINGDONG(N) is the symmetric N-by-N Hankel matrix with
4 % A(i,j) = 0.5/(N-i-j+1.5).
5 % The eigenvalues of A cluster around PI/2 and -PI/2.
6
7 % Invented by F.N. Ris.
8 %
9 % Reference:
10 % J.C. Nash, Compact Numerical Methods for Computers: Linear
11 % Algebra and Function Minimisation, second edition, Adam Hilger,
12 % Bristol, 1990 (Appendix 1).
13
14 p= -2*(1:n) + (n+1.5);
15 A = cauchy(p);