Last change
on this file since 11169 was 731, 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 slaMxv ( float rm[3][3], float va[3], float vb[3] )
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4 | /*
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5 | ** - - - - - - -
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6 | ** s l a M x v
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7 | ** - - - - - - -
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8 | **
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9 | ** Perform the 3-d forward unitary transformation:
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10 | **
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11 | ** vector vb = matrix rm * vector va
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12 | **
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13 | ** (single precision)
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14 | **
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15 | ** Given:
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16 | ** rm float[3][3] matrix
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17 | ** va float[3] vector
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18 | **
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19 | ** Returned:
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20 | ** vb float[3] result vector
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21 | **
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22 | ** Note: va and vb may be the same array.
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23 | **
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24 | ** Last revision: 6 November 1999
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25 | **
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26 | ** Copyright P.T.Wallace. All rights reserved.
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27 | */
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28 | {
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29 | int i, j;
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30 | float w, vw[3];
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31 |
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32 | /* Matrix rm * vector va -> vector vw */
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33 | for ( j = 0; j < 3; j++ ) {
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34 | w = 0.0f;
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35 | for ( i = 0; i < 3; i++ ) {
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36 | w += rm[j][i] * va[i];
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37 | }
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38 | vw[j] = w;
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39 | }
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40 |
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41 | /* Vector vw -> vector vb */
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42 | for ( j = 0; j < 3; j++ ) {
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43 | vb[j] = vw[j];
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44 | }
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45 | }
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