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annotate toolbox/rando.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
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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 = rando(n, k)
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2 %RANDO Random matrix with elements -1, 0 or 1.
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3 % A = RANDO(N, K) is a random N-by-N matrix with elements from
8f23314345f4 Create local repository for matrix toolboxes. Step #0 done.
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4 % one of the following discrete distributions (default K = 1):
8f23314345f4 Create local repository for matrix toolboxes. Step #0 done.
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5 % K = 1: A(i,j) = 0 or 1 with equal probability,
8f23314345f4 Create local repository for matrix toolboxes. Step #0 done.
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6 % K = 2: A(i,j) = -1 or 1 with equal probability,
8f23314345f4 Create local repository for matrix toolboxes. Step #0 done.
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7 % K = 3: A(i,j) = -1, 0 or 1 with equal probability.
8f23314345f4 Create local repository for matrix toolboxes. Step #0 done.
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8 % N may be a 2-vector, in which case the matrix is N(1)-by-N(2).
8f23314345f4 Create local repository for matrix toolboxes. Step #0 done.
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8f23314345f4 Create local repository for matrix toolboxes. Step #0 done.
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10 if nargin < 2, k = 1; end
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12 m = n(1); % Parameter n specifies dimension: m-by-n.
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13 n = n(max(size(n)));
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8f23314345f4 Create local repository for matrix toolboxes. Step #0 done.
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15 if k == 1 % {0, 1}
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16 A = floor( rand(m,n) + .5 );
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17 elseif k == 2 % {-1, 1}
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18 A = 2*floor( rand(m,n) + .5 ) - 1;
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19 elseif k == 3 % {-1, 0, 1}
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20 A = round( 3*rand(m,n) - 1.5 );
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21 end