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[37] | 1 | function d = tril(v, k) |
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| 2 | % TRIL Extract lower triangular part. |
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| 3 | % (Quaternion overloading of standard Matlab function.) |
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| 4 | |
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| 5 | % Copyright © 2005 Stephen J. Sangwine and Nicolas Le Bihan. |
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| 6 | % See the file : Copyright.m for further details. |
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| 7 | |
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| 8 | error(nargchk(1, 2, nargin)), error(nargoutchk(0, 1, nargout)) |
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| 9 | |
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| 10 | if nargin == 1 |
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| 11 | if ispure(v) |
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| 12 | d = quaternion( tril(x(v)), tril(y(v)), tril(z(v))); |
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| 13 | else |
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| 14 | d = quaternion(tril(s(v)), tril(x(v)), tril(y(v)), tril(z(v))); |
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| 15 | end |
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| 16 | else |
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| 17 | if ispure(v) |
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| 18 | d = quaternion( tril(x(v), k), tril(y(v), k), tril(z(v), k)); |
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| 19 | else |
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| 20 | d = quaternion(tril(s(v), k), tril(x(v), k), tril(y(v), k), tril(z(v), k)); |
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| 21 | end |
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| 22 | end |
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