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1 | function x = scalar(q) |
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2 | % SCALAR Quaternion scalar part. |
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3 | % |
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4 | % This function returns zero in the case of pure quaternions, |
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5 | % whereas the function S gives an error if q is pure. |
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6 | |
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7 | % Copyright © 2005 Stephen J. Sangwine and Nicolas Le Bihan. |
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8 | % See the file : Copyright.m for further details. |
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9 | |
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10 | error(nargchk(1, 1, nargin)), error(nargoutchk(0, 1, nargout)) |
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11 | |
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12 | % A possible problem here: zeros will return a double array |
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13 | % and if Q has some other type, the result will not be of the |
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14 | % same type. |
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15 | |
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16 | if ispure(q) |
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17 | x = zeros(size(q)); |
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18 | else |
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19 | x = s(q); |
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20 | end |
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