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[37] | 1 | function tf = ispure(q) |
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| 2 | % ISPURE Tests whether a quaternion is pure. |
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| 3 | % tf = ispure(q) returns 1 if q has no scalar part, 0 if not. |
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| 4 | % Note that if q has a scalar part which is zero, ispure(q) returns 1. |
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| 5 | |
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| 6 | % Copyright © 2005 Stephen J. Sangwine and Nicolas Le Bihan. |
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| 7 | % See the file : Copyright.m for further details. |
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| 8 | |
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| 9 | error(nargchk(1, 1, nargin)), error(nargoutchk(0, 1, nargout)) |
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| 10 | |
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| 11 | % Implementation note. This function uses ispure_internal, so that the knowledge of |
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| 12 | % how quaternions are represented is hidden in the private functions. |
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| 13 | |
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| 14 | tf = ispure_internal(q); |
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