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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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