Last change
on this file since 9472 was 732, checked in by tbretz, 24 years ago |
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1 | #include "slalib.h"
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2 | #include "slamac.h"
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3 | void slaVxv ( float va[3], float vb[3], float vc[3] )
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4 | /*
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5 | ** - - - - - - -
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6 | ** s l a V x v
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7 | ** - - - - - - -
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8 | **
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9 | ** Vector product of two 3-vectors.
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10 | **
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11 | ** (single precision)
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12 | **
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13 | ** Given:
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14 | ** va float[3] first vector
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15 | ** vb float[3] second vector
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16 | **
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17 | ** Returned:
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18 | ** vc float[3] vector result
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19 | **
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20 | ** Note: the same vector may be specified more than once.
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21 | **
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22 | ** Last revision: 6 November 1999
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23 | **
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24 | ** Copyright P.T.Wallace. All rights reserved.
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25 | */
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26 | {
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27 | float vw[3];
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28 | int i;
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29 |
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30 | /* Form the vector product va cross vb */
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31 | vw[0] = va[1] * vb[2] - va[2] * vb[1];
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32 | vw[1] = va[2] * vb[0] - va[0] * vb[2];
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33 | vw[2] = va[0] * vb[1] - va[1] * vb[0];
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34 |
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35 | /* Return the result */
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36 | for ( i = 0; i < 3; i++ ) vc[i] = vw[i];
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37 | }
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