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annotate toolbox/lotkin.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
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8f23314345f4 Create local repository for matrix toolboxes. Step #0 done.
Antonio Pino Robles <data.script93@gmail.com>
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1 function A = lotkin(n)
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2 %LOTKIN Lotkin matrix.
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3 % A = LOTKIN(N) is the Hilbert matrix with its first row altered to
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Antonio Pino Robles <data.script93@gmail.com>
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4 % all ones. A is unsymmetric, ill-conditioned, and has many negative
8f23314345f4 Create local repository for matrix toolboxes. Step #0 done.
Antonio Pino Robles <data.script93@gmail.com>
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5 % eigenvalues of small magnitude.
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Antonio Pino Robles <data.script93@gmail.com>
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6 % The inverse has integer entries and is known explicitly.
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8f23314345f4 Create local repository for matrix toolboxes. Step #0 done.
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8 % Reference:
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9 % M. Lotkin, A set of test matrices, MTAC, 9 (1955), pp. 153-161.
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8f23314345f4 Create local repository for matrix toolboxes. Step #0 done.
Antonio Pino Robles <data.script93@gmail.com>
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11 A = hilb(n);
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12 A(1,:) = ones(1,n);