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1 | /*************************************************************************/ |
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2 | /* */ |
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3 | /* Tabluate logs and log factorials (to improve speed) */ |
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4 | /* -------------------------------- */ |
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5 | /* */ |
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6 | /*************************************************************************/ |
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7 | |
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8 | |
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9 | #include "defns.i" |
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10 | #include "types.i" |
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11 | #include "extern.i" |
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12 | |
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13 | |
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14 | float *LogItemNo; |
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15 | double *LogFact; |
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16 | |
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17 | |
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18 | /*************************************************************************/ |
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19 | /* */ |
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20 | /* Set up the array LogItemNo to contain the logs of integers and */ |
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21 | /* the array LogFact to contain logs of factorials (all to base 2) */ |
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22 | /* */ |
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23 | /*************************************************************************/ |
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24 | |
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25 | |
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26 | GenerateLogs() |
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27 | /* ------------ */ |
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28 | { |
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29 | ItemNo i; |
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30 | |
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31 | LogItemNo = (float *) malloc((MaxItem+100) * sizeof(float)); |
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32 | LogFact = (double *) malloc((MaxItem+100) * sizeof(double)); |
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33 | |
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34 | LogItemNo[0] = -1E38; |
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35 | LogItemNo[1] = 0; |
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36 | LogFact[0] = LogFact[1] = 0; |
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37 | |
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38 | ForEach(i, 2, MaxItem+99) |
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39 | { |
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40 | LogItemNo[i] = log((float) i) / Log2; |
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41 | LogFact[i] = LogFact[i-1] + LogItemNo[i]; |
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42 | } |
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43 | } |
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