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1 | function Y = acos(X) |
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2 | % ACOS Inverse cosine. |
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3 | % (Quaternion overloading of standard Matlab function.) |
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4 | |
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5 | % Copyright © 2006 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, 1, nargin)), error(nargoutchk(0, 1, nargout)) |
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9 | |
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10 | if isreal(X) |
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11 | |
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12 | % X is a real quaternion, and we compute the inverse cosine of an |
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13 | % isomorphic complex number using the standard Matlab acos function, |
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14 | % then construct a quaternion with the same axis as the original |
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15 | % quaternion. |
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16 | |
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17 | Y = isoquaternion(acos(isocomplex(X)), X); |
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18 | else |
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19 | |
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20 | % X is a complex quaternion, and therefore we cannot use the method |
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21 | % above for real quaternions, because it is not possible to construct |
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22 | % an isomorphic complex number. |
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23 | |
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24 | error('quaternion/acos is not yet implemented for complex quaternions'); |
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25 | end; |
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