Re: [血尿] 德天使

看板SD-GundamOL (SD鋼彈 Online)作者leafwind (有葉玉米)時間15年前 (2010/08/01 21:45)推噓9(9推 0噓 17→)

留言26則, 12人參與討論串2/2 (看更多)

（補充：此篇原因為上一篇推文有人詢問「如果每台機體機率均為1/6，那要多少抽才收集完四台天使？」因此與現實狀況極可能有出入，因為A神龍與A死明顯機率較高）我的機率真的不好.. 結果還是寫程式讓他統計比較快＝＝＝＝＝＝＝output＝＝＝＝＝ test if it is a fair dice in 600,000 tosses: 100173 99920 99318 100387 100345 99857 test start! stop if number 1,2,3,4 have show up: 4 3 1 1 4 2 you have tossed 15 times. stop if number 1,2,3,4 have show up: 4 4 1 3 1 3 you have tossed 16 times. stop if number 1,2,3,4 have show up: 1 1 1 2 0 1 you have tossed 6 times. stop if number 1,2,3,4 have show up: 1 1 3 3 3 4 you have tossed 15 times. stop if number 1,2,3,4 have show up: 1 3 4 1 5 2 you have tossed 16 times. stop if number 1,2,3,4 have show up: 1 1 1 3 3 6 you have tossed 15 times. stop if number 1,2,3,4 have show up: 1 3 1 3 3 2 you have tossed 13 times. stop if number 1,2,3,4 have show up: 2 1 3 2 2 1 you have tossed 11 times. stop if number 1,2,3,4 have show up: 1 2 1 3 3 0 you have tossed 10 times. stop if number 1,2,3,4 have show up: 1 5 4 1 1 3 you have tossed 15 times. Acerage toss times need: 13 這是10次平均的結果我也有改成測十萬次，結果平均是12次左右可以集滿四天使因為版面有限就不貼上來了有興趣又不怕傷眼的可以幫我找找哪裡寫錯..隨便亂搞的可能有寫錯:P 另外徵求機率魔人解答..為什麼期望值是12次..我不清楚XDDD ＝＝＝＝＝＝＝＝＝＝ #include <stdio.h> #include <stdlib.h> #include <time.h> #define TEST_TIMES 100000 int main(void) { int i, j; int count[6] = {0}; srand(time(NULL)); for(i = 0; i < 600000; i++) { count[rand()%6]++; } printf("test if it is a fair dice in 600,000 tosses:\n"); for(i = 0; i < 6; i++) { printf("%d ", count[i]); count[i] = 0; } printf("\n\ntest start!\n\n"); int toss_count = 0; int record[TEST_TIMES]; for(i = 0; i < TEST_TIMES; i++) { while( (!count[0]) || (!count[1]) || (!count[2]) || (!count[3]) ) { count[rand()%6]++; toss_count++; } printf("stop if number 1,2,3,4 have show up:\n"); for(j = 0; j < 6; j++) { printf("%d ", count[j]); } printf("you have tossed %d times.\n", toss_count); record[i] = toss_count; // reset data for(j = 0; j < 6; j++) { count[j] = 0; } toss_count = 0; } // summary phase int sum = 0; for(i = 0; i < TEST_TIMES; i++) { sum += record[i]; } int avg_toss_times = sum / TEST_TIMES; printf("Acerage toss times need: %d\n", avg_toss_times); return 0; } -- 問題是扭蛋不可能公平都1/6機率阿.. 那這篇不就跟SD無關了囧> -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 118.166.170.160

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oldchiou

08/01 21:48, , 1^F

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LADKUO56

08/01 21:58, , 2^F

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Saint1225

08/01 21:58, , 3^F

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