回答編集履歴
2
微修正
test
CHANGED
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@@ -10,7 +10,7 @@
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10
10
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11
11
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12
12
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13
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-
#define at(t,x
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13
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#define at(t,y,x) t[y*4+x]
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16
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1
追記
test
CHANGED
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@@ -1 +1,89 @@
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1
1
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簡単もなにもベクトルの内積を4x4回繰り返す以外なんかあるん?
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2
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3
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4
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5
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[追記] 愚直な実装でよければ:
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6
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7
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```C
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8
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9
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#include <stdio.h>
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10
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11
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12
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13
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#define at(t,x,y) t[y*4+x]
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14
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15
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16
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int main() {
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18
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19
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float a[16] = {
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20
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21
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1.000000,0.000000,0.000000,0.000000,
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22
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23
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0.000000,1.000000,0.000000,0.000000,
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24
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0.000000,0.000000,1.000000,0.000000,
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26
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27
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0.000000,0.000000,0.000000,1.000000 };
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28
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29
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30
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31
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float b[16] = {
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32
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33
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1.000000,0.000000,0.000000,0.000000,
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34
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35
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0.000000,1.000000,0.000000,0.000000,
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36
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37
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0.000000,0.000000,1.000000,0.000000,
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38
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39
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0.000000,0.000000,0.000000,1.000000 };
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40
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41
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42
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43
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float c[16];
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44
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45
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46
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47
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int row, col;
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48
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49
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for ( row = 0; row < 4; ++row ) {
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50
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51
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for ( col =0; col < 4; ++col ) {
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52
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53
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float sum = 0.0f;
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54
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55
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int t;
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56
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57
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for ( t = 0; t <4; ++t ) {
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58
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59
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sum += at(a,row,t) * at(b,t,col);
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60
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61
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}
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62
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63
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at(c,row,col) = sum;
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64
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65
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}
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66
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67
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}
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68
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69
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70
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71
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// できたかな?
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72
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73
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for ( row = 0; row < 4; ++row) {
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74
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75
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for ( col = 0; col < 4; ++col) {
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76
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77
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printf("%f ", at(c,row,col));
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78
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79
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}
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80
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81
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puts("");
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82
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83
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}
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84
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85
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return 0;
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86
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87
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}
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88
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89
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```
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