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1楼 2012-06-14 00:16:11

已阅关注TA 给TA发消息送TA红花 TA的回帖

mshwangg

至尊木虫 (正式写手)

程序强帖: 5
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注册: 2008-06-21
专业: 物理学I

引用回帖:

8楼: Originally posted by chineserice at 2012-06-14 13:27:22
小木虫真是牛人辈出，昨天提出问题需找软件，发了两个帖子，两天解决问题~ o yeah~

...

人外有人，每个人都有他的长处和短板。何必与别人计较短短长长？够用就好

赞一下

回复此楼

9楼2012-06-15 01:28:18

已阅关注TA 给TA发消息送TA红花 TA的回帖

查看全部 10 个回答

mshwangg

至尊木虫 (正式写手)

程序强帖: 5
应助: 206 (大学生)
金币: 10702.8
散金: 100
红花: 19
帖子: 597
在线: 195.4小时
虫号: 576702
注册: 2008-06-21
专业: 物理学I

【答案】应助回帖

★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
感谢参与，应助指数 +1
chineserice: 金币+10, ★★★★★最佳答案, 感谢，我在研究一下下~ 2012-06-14 01:47:46
chineserice: 金币+20, ★★★★★最佳答案, 我也搞定了~ 非常感谢了，就是不知道怎么和老板汇报，在国外也不能说我用了盗版软件吧。 2012-06-14 13:21:00

很快就出结果了呀，你在未知量{A,B,C,D}前面的逗号之前少了一个}
就是方程需要用{}括起来，你只写了{，没写}
结果如下：
{{A -> 0. + (1. (-1. ((0. xi - 1. xim1) (-0.5 xi^3 -
            1. (0.5 xi + xim1)^3) -
         1. (-0.5 xi - 1. (0.5 xi + xim1)) (0.5 xi^3 -
            1. (0.5 xi + xim1)^3)) (-1. (1.09091 +
            0. (0.5 xi + xim1)) (-0.5 xi^2 +
            1. (0.5 xi + xim1)^2) + (0. xi -
            1. xim1) (0. (0.5 xi + xim1)^2 +
            2. (0.0454545 (-0.5 xi - 0.5 xim1) +
               0.0454545 (0.5 xi + 0.5 xip1)))) + (-0.25 xi^3 +
         1. xi^2 xim1 + 1. xi xim1^2 +
         0. xim1^3) (-1. (1.09091 +
            0. (0.5 xi + xim1)) (0.5 xi^3 -
            1. (0.5 xi + xim1)^3) + (0. xi -
            1. xim1) (0. (0.5 xi + xim1)^3 +
            3. (0.0454545 (0.5 xi + 0.5 xim1)^2 +
               0.0454545 (0.5 xi + 0.5 xip1)^2)))))/(-1. ((0. xi -
         1. xim1) (-0.5 xi^3 - 1. (0.5 xi + xim1)^3) -
      1. (-0.5 xi - 1. (0.5 xi + xim1)) (0.5 xi^3 -
         1. (0.5 xi + xim1)^3)) (-1. (-0.5 xi^2 +
         1. (0.5 xi + xim1)^2) (-1. (0.5 xi + xim1) -
         1. (0.5 xi + xip1)) + (0. xi -
         1. xim1) (1. (0.5 xi + xim1)^2 -
         1. (0.5 xi + xip1)^2)) + (-0.25 xi^3 + 1. xi^2 xim1 +
      1. xi xim1^2 +

      0. xim1^3) (-1. (0.5 xi^3 -
         1. (0.5 xi + xim1)^3) (-1. (0.5 xi + xim1) -
         1. (0.5 xi + xip1)) + (0. xi -
         1. xim1) (-1. (0.5 xi + xim1)^3 -
         1. (0.5 xi + xip1)^3))) +
1. ((-1. (1.09091 + 0. (0.5 xi + xim1)) (-0.5 xi^2 +
         1. (0.5 xi + xim1)^2) + (0. xi -
         1. xim1) (0. (0.5 xi + xim1)^2 +
         2. (0.0454545 (-0.5 xi - 0.5 xim1) +
            0.0454545 (0.5 xi + 0.5 xip1))))/(-0.25 xi^3 +
      1. xi^2 xim1 + 1. xi xim1^2 +
      0. xim1^3) - (1. (-1. ((0. xi - 1. xim1) (-0.5 xi^3 -
               1. (0.5 xi + xim1)^3) -
            1. (-0.5 xi - 1. (0.5 xi + xim1)) (0.5 xi^3 -
               1. (0.5 xi + xim1)^3)) (-1. (1.09091 +
               0. (0.5 xi + xim1)) (-0.5 xi^2 +
               1. (0.5 xi + xim1)^2) + (0. xi -
               1. xim1) (0. (0.5 xi + xim1)^2 +
               2. (0.0454545 (-0.5 xi - 0.5 xim1) +
                  0.0454545 (0.5 xi + 0.5 xip1)))) + (-0.25 xi^3 +
            1. xi^2 xim1 + 1. xi xim1^2 +
            0. xim1^3) (-1. (1.09091 +
               0. (0.5 xi + xim1)) (0.5 xi^3 -
               1. (0.5 xi + xim1)^3) + (0. xi -
               1. xim1) (0. (0.5 xi + xim1)^3 +
               3. (0.0454545 (0.5 xi + 0.5 xim1)^2 +

                  0.0454545 (0.5 xi +
                  0.5 xip1)^2)))) (-1. (-0.5 xi^2 +
            1. (0.5 xi + xim1)^2) (-1. (0.5 xi + xim1) -
            1. (0.5 xi + xip1)) + (0. xi -
            1. xim1) (1. (0.5 xi + xim1)^2 -
            1. (0.5 xi + xip1)^2)))/((-0.25 xi^3 + 1. xi^2 xim1 +
         1. xi xim1^2 +
         0. xim1^3) (-1. ((0. xi - 1. xim1) (-0.5 xi^3 -
               1. (0.5 xi + xim1)^3) -
            1. (-0.5 xi - 1. (0.5 xi + xim1)) (0.5 xi^3 -
               1. (0.5 xi + xim1)^3)) (-1. (-0.5 xi^2 +
               1. (0.5 xi + xim1)^2) (-1. (0.5 xi + xim1) -
               1. (0.5 xi + xip1)) + (0. xi -
               1. xim1) (1. (0.5 xi + xim1)^2 -
               1. (0.5 xi + xip1)^2)) + (-0.25 xi^3 +
            1. xi^2 xim1 + 1. xi xim1^2 +
            0. xim1^3) (-1. (0.5 xi^3 -
               1. (0.5 xi + xim1)^3) (-1. (0.5 xi + xim1) -
               1. (0.5 xi + xip1)) + (0. xi -
               1. xim1) (-1. (0.5 xi + xim1)^3 -
               1. (0.5 xi + xip1)^3))))) +
1. ((1.09091 + 0. (0.5 xi + xim1))/(
   0. xi - 1. xim1) - (1. (-1. ((0. xi - 1. xim1) (-0.5 xi^3 -
               1. (0.5 xi + xim1)^3) -
            1. (-0.5 xi - 1. (0.5 xi + xim1)) (0.5 xi^3 -
               1. (0.5 xi + xim1)^3)) (-1. (1.09091 +
               0. (0.5 xi + xim1)) (-0.5 xi^2 +
               1. (0.5 xi + xim1)^2) + (0. xi -
               1. xim1) (0. (0.5 xi + xim1)^2 +
               2. (0.0454545 (-0.5 xi - 0.5 xim1) +
                  0.0454545 (0.5 xi + 0.5 xip1)))) + (-0.25 xi^3 +
            1. xi^2 xim1 + 1. xi xim1^2 +
            0. xim1^3) (-1. (1.09091 +
               0. (0.5 xi + xim1)) (0.5 xi^3 -
               1. (0.5 xi + xim1)^3) + (0. xi -
               1. xim1) (0. (0.5 xi + xim1)^3 +
               3. (0.0454545 (0.5 xi + 0.5 xim1)^2 +
                  0.0454545 (0.5 xi + 0.5 xip1)^2)))) (-1. (0.5 xi +
            xim1) - 1. (0.5 xi + xip1)))/((0. xi -
         1. xim1) (-1. ((0. xi - 1. xim1) (-0.5 xi^3 -
               1. (0.5 xi + xim1)^3) -
            1. (-0.5 xi - 1. (0.5 xi + xim1)) (0.5 xi^3 -
               1. (0.5 xi + xim1)^3)) (-1. (-0.5 xi^2 +
               1. (0.5 xi + xim1)^2) (-1. (0.5 xi + xim1) -
               1. (0.5 xi + xip1)) + (0. xi -
               1. xim1) (1. (0.5 xi + xim1)^2 -
               1. (0.5 xi + xip1)^2)) + (-0.25 xi^3 +
            1. xi^2 xim1 + 1. xi xim1^2 +
            0. xim1^3) (-1. (0.5 xi^3 -
               1. (0.5 xi + xim1)^3) (-1. (0.5 xi + xim1) -
               1. (0.5 xi + xip1)) + (0. xi -
               1. xim1) (-1. (0.5 xi + xim1)^3 -
               1. (0.5 xi + xip1)^3)))) -
   1/(0. xi - 1. xim1)
      1. (-0.5 xi -
      1. (0.5 xi +
         xim1)) ((-1. (1.09091 + 0. (0.5 xi + xim1)) (-0.5 xi^2 +
            1. (0.5 xi + xim1)^2) + (0. xi -
            1. xim1) (0. (0.5 xi + xim1)^2 +
            2. (0.0454545 (-0.5 xi - 0.5 xim1) +
               0.0454545 (0.5 xi + 0.5 xip1))))/(-0.25 xi^3 +
         1. xi^2 xim1 + 1. xi xim1^2 +
         0. xim1^3) - (1. (-1. ((0. xi - 1. xim1) (-0.5 xi^3 -
                  1. (0.5 xi + xim1)^3) -
               1. (-0.5 xi - 1. (0.5 xi + xim1)) (0.5 xi^3 -
                  1. (0.5 xi + xim1)^3)) (-1. (1.09091 +
                  0. (0.5 xi + xim1)) (-0.5 xi^2 +
                  1. (0.5 xi + xim1)^2) + (0. xi -
                  1. xim1) (0. (0.5 xi + xim1)^2 +
                  2. (0.0454545 (-0.5 xi - 0.5 xim1) +
                  0.0454545 (0.5 xi + 0.5 xip1)))) + (-0.25 xi^3 +
               1. xi^2 xim1 + 1. xi xim1^2 +
               0. xim1^3) (-1. (1.09091 +
                  0. (0.5 xi + xim1)) (0.5 xi^3 -
                  1. (0.5 xi + xim1)^3) + (0. xi -
                  1. xim1) (0. (0.5 xi + xim1)^3 +
                  3. (0.0454545 (0.5 xi + 0.5 xim1)^2 +

                  0.0454545 (0.5 xi +
                  0.5 xip1)^2)))) (-1. (-0.5 xi^2 +
               1. (0.5 xi + xim1)^2) (-1. (0.5 xi + xim1) -
               1. (0.5 xi + xip1)) + (0. xi -
               1. xim1) (1. (0.5 xi + xim1)^2 -
               1. (0.5 xi + xip1)^2)))/((-0.25 xi^3 +
            1. xi^2 xim1 + 1. xi xim1^2 +
            0. xim1^3) (-1. ((0. xi - 1. xim1) (-0.5 xi^3 -
                  1. (0.5 xi + xim1)^3) -
               1. (-0.5 xi - 1. (0.5 xi + xim1)) (0.5 xi^3 -
                  1. (0.5 xi + xim1)^3)) (-1. (-0.5 xi^2 +
                  1. (0.5 xi + xim1)^2) (-1. (0.5 xi + xim1) -
                  1. (0.5 xi + xip1)) + (0. xi -
                  1. xim1) (1. (0.5 xi + xim1)^2 -
                  1. (0.5 xi + xip1)^2)) + (-0.25 xi^3 +
               1. xi^2 xim1 + 1. xi xim1^2 +
               0. xim1^3) (-1. (0.5 xi^3 -
                  1. (0.5 xi + xim1)^3) (-1. (0.5 xi + xim1) -
                  1. (0.5 xi + xip1)) + (0. xi -
                  1. xim1) (-1. (0.5 xi + xim1)^3 -
                  1. (0.5 xi + xip1)^3)))))),
  B -> -((1. (1.09091 + 0. (0.5 xi + xim1)))/(
   0. xi - 1. xim1)) + (1. (-1. ((0. xi - 1. xim1) (-0.5 xi^3 -
            1. (0.5 xi + xim1)^3) -
         1. (-0.5 xi - 1. (0.5 xi + xim1)) (0.5 xi^3 -
            1. (0.5 xi + xim1)^3)) (-1. (1.09091 +
            0. (0.5 xi + xim1)) (-0.5 xi^2 +
            1. (0.5 xi + xim1)^2) + (0. xi -
            1. xim1) (0. (0.5 xi + xim1)^2 +
            2. (0.0454545 (-0.5 xi - 0.5 xim1) +
               0.0454545 (0.5 xi + 0.5 xip1)))) + (-0.25 xi^3 +
         1. xi^2 xim1 + 1. xi xim1^2 +
         0. xim1^3) (-1. (1.09091 +
            0. (0.5 xi + xim1)) (0.5 xi^3 -
            1. (0.5 xi + xim1)^3) + (0. xi -
            1. xim1) (0. (0.5 xi + xim1)^3 +
            3. (0.0454545 (0.5 xi + 0.5 xim1)^2 +
               0.0454545 (0.5 xi + 0.5 xip1)^2)))) (-1. (0.5 xi +
         xim1) - 1. (0.5 xi + xip1)))/((0. xi -
      1. xim1) (-1. ((0. xi - 1. xim1) (-0.5 xi^3 -
            1. (0.5 xi + xim1)^3) -
         1. (-0.5 xi - 1. (0.5 xi + xim1)) (0.5 xi^3 -
            1. (0.5 xi + xim1)^3)) (-1. (-0.5 xi^2 +
            1. (0.5 xi + xim1)^2) (-1. (0.5 xi + xim1) -
            1. (0.5 xi + xip1)) + (0. xi -
            1. xim1) (1. (0.5 xi + xim1)^2 -
            1. (0.5 xi + xip1)^2)) + (-0.25 xi^3 + 1. xi^2 xim1 +
         1. xi xim1^2 +
         0. xim1^3) (-1. (0.5 xi^3 -
            1. (0.5 xi + xim1)^3) (-1. (0.5 xi + xim1) -
            1. (0.5 xi + xip1)) + (0. xi -
            1. xim1) (-1. (0.5 xi + xim1)^3 -
            1. (0.5 xi + xip1)^3)))) +
1/(0. xi - 1. xim1)
   1. (-0.5 xi -
   1. (0.5 xi +
      xim1)) ((-1. (1.09091 + 0. (0.5 xi + xim1)) (-0.5 xi^2 +
         1. (0.5 xi + xim1)^2) + (0. xi -
         1. xim1) (0. (0.5 xi + xim1)^2 +
         2. (0.0454545 (-0.5 xi - 0.5 xim1) +
            0.0454545 (0.5 xi + 0.5 xip1))))/(-0.25 xi^3 +
      1. xi^2 xim1 + 1. xi xim1^2 +
      0. xim1^3) - (1. (-1. ((0. xi - 1. xim1) (-0.5 xi^3 -
               1. (0.5 xi + xim1)^3) -
            1. (-0.5 xi - 1. (0.5 xi + xim1)) (0.5 xi^3 -
               1. (0.5 xi + xim1)^3)) (-1. (1.09091 +
               0. (0.5 xi + xim1)) (-0.5 xi^2 +
               1. (0.5 xi + xim1)^2) + (0. xi -
               1. xim1) (0. (0.5 xi + xim1)^2 +
               2. (0.0454545 (-0.5 xi - 0.5 xim1) +
                  0.0454545 (0.5 xi + 0.5 xip1)))) + (-0.25 xi^3 +
            1. xi^2 xim1 + 1. xi xim1^2 +
            0. xim1^3) (-1. (1.09091 +
               0. (0.5 xi + xim1)) (0.5 xi^3 -
               1. (0.5 xi + xim1)^3) + (0. xi -
               1. xim1) (0. (0.5 xi + xim1)^3 +
               3. (0.0454545 (0.5 xi + 0.5 xim1)^2 +

                  0.0454545 (0.5 xi +
                  0.5 xip1)^2)))) (-1. (-0.5 xi^2 +
            1. (0.5 xi + xim1)^2) (-1. (0.5 xi + xim1) -
            1. (0.5 xi + xip1)) + (0. xi -
            1. xim1) (1. (0.5 xi + xim1)^2 -
            1. (0.5 xi + xip1)^2)))/((-0.25 xi^3 + 1. xi^2 xim1 +
         1. xi xim1^2 +
         0. xim1^3) (-1. ((0. xi - 1. xim1) (-0.5 xi^3 -
               1. (0.5 xi + xim1)^3) -
            1. (-0.5 xi - 1. (0.5 xi + xim1)) (0.5 xi^3 -
               1. (0.5 xi + xim1)^3)) (-1. (-0.5 xi^2 +
               1. (0.5 xi + xim1)^2) (-1. (0.5 xi + xim1) -
               1. (0.5 xi + xip1)) + (0. xi -
               1. xim1) (1. (0.5 xi + xim1)^2 -
               1. (0.5 xi + xip1)^2)) + (-0.25 xi^3 +
            1. xi^2 xim1 + 1. xi xim1^2 +
            0. xim1^3) (-1. (0.5 xi^3 -
               1. (0.5 xi + xim1)^3) (-1. (0.5 xi + xim1) -
               1. (0.5 xi + xip1)) + (0. xi -
               1. xim1) (-1. (0.5 xi + xim1)^3 -
               1. (0.5 xi + xip1)^3))))),
  C -> -(1. (-1. (1.09091 + 0. (0.5 xi + xim1)) (-0.5 xi^2 +
         1. (0.5 xi + xim1)^2) + (0. xi -
         1. xim1) (0. (0.5 xi + xim1)^2 +
         2. (0.0454545 (-0.5 xi - 0.5 xim1) +
            0.0454545 (0.5 xi + 0.5 xip1)))))/(-0.25 xi^3 +
   1. xi^2 xim1 + 1. xi xim1^2 +
   0. xim1^3) + (1. (-1. ((0. xi - 1. xim1) (-0.5 xi^3 -
            1. (0.5 xi + xim1)^3) -
         1. (-0.5 xi - 1. (0.5 xi + xim1)) (0.5 xi^3 -
            1. (0.5 xi + xim1)^3)) (-1. (1.09091 +
            0. (0.5 xi + xim1)) (-0.5 xi^2 +
            1. (0.5 xi + xim1)^2) + (0. xi -
            1. xim1) (0. (0.5 xi + xim1)^2 +
            2. (0.0454545 (-0.5 xi - 0.5 xim1) +
               0.0454545 (0.5 xi + 0.5 xip1)))) + (-0.25 xi^3 +
         1. xi^2 xim1 + 1. xi xim1^2 +
         0. xim1^3) (-1. (1.09091 +
            0. (0.5 xi + xim1)) (0.5 xi^3 -
            1. (0.5 xi + xim1)^3) + (0. xi -
            1. xim1) (0. (0.5 xi + xim1)^3 +
            3. (0.0454545 (0.5 xi + 0.5 xim1)^2 +
               0.0454545 (0.5 xi +
                  0.5 xip1)^2)))) (-1. (-0.5 xi^2 +
         1. (0.5 xi + xim1)^2) (-1. (0.5 xi + xim1) -
         1. (0.5 xi + xip1)) + (0. xi -
         1. xim1) (1. (0.5 xi + xim1)^2 -
         1. (0.5 xi + xip1)^2)))/((-0.25 xi^3 + 1. xi^2 xim1 +
      1. xi xim1^2 +
      0. xim1^3) (-1. ((0. xi - 1. xim1) (-0.5 xi^3 -
            1. (0.5 xi + xim1)^3) -
         1. (-0.5 xi - 1. (0.5 xi + xim1)) (0.5 xi^3 -
            1. (0.5 xi + xim1)^3)) (-1. (-0.5 xi^2 +
            1. (0.5 xi + xim1)^2) (-1. (0.5 xi + xim1) -
            1. (0.5 xi + xip1)) + (0. xi -
            1. xim1) (1. (0.5 xi + xim1)^2 -
            1. (0.5 xi + xip1)^2)) + (-0.25 xi^3 + 1. xi^2 xim1 +
         1. xi xim1^2 +
         0. xim1^3) (-1. (0.5 xi^3 -
            1. (0.5 xi + xim1)^3) (-1. (0.5 xi + xim1) -
            1. (0.5 xi + xip1)) + (0. xi -
            1. xim1) (-1. (0.5 xi + xim1)^3 -
            1. (0.5 xi + xip1)^3)))),
  D -> -(1. (-1. ((0. xi - 1. xim1) (-0.5 xi^3 -
            1. (0.5 xi + xim1)^3) -
         1. (-0.5 xi - 1. (0.5 xi + xim1)) (0.5 xi^3 -
            1. (0.5 xi + xim1)^3)) (-1. (1.09091 +
            0. (0.5 xi + xim1)) (-0.5 xi^2 +
            1. (0.5 xi + xim1)^2) + (0. xi -
            1. xim1) (0. (0.5 xi + xim1)^2 +
            2. (0.0454545 (-0.5 xi - 0.5 xim1) +
               0.0454545 (0.5 xi + 0.5 xip1)))) + (-0.25 xi^3 +
         1. xi^2 xim1 + 1. xi xim1^2 +
         0. xim1^3) (-1. (1.09091 +
            0. (0.5 xi + xim1)) (0.5 xi^3 -
            1. (0.5 xi + xim1)^3) + (0. xi -
            1. xim1) (0. (0.5 xi + xim1)^3 +
            3. (0.0454545 (0.5 xi + 0.5 xim1)^2 +
               0.0454545 (0.5 xi + 0.5 xip1)^2)))))/(-1. ((0. xi -
         1. xim1) (-0.5 xi^3 - 1. (0.5 xi + xim1)^3) -
      1. (-0.5 xi - 1. (0.5 xi + xim1)) (0.5 xi^3 -
         1. (0.5 xi + xim1)^3)) (-1. (-0.5 xi^2 +
         1. (0.5 xi + xim1)^2) (-1. (0.5 xi + xim1) -
         1. (0.5 xi + xip1)) + (0. xi -
         1. xim1) (1. (0.5 xi + xim1)^2 -
         1. (0.5 xi + xip1)^2)) + (-0.25 xi^3 + 1. xi^2 xim1 +
      1. xi xim1^2 +
      0. xim1^3) (-1. (0.5 xi^3 -
         1. (0.5 xi + xim1)^3) (-1. (0.5 xi + xim1) -
         1. (0.5 xi + xip1)) + (0. xi -
         1. xim1) (-1. (0.5 xi + xim1)^3 -
         1. (0.5 xi + xip1)^3)))}}

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2楼2012-06-14 00:45:27

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chineserice

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3楼2012-06-14 01:56:53

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3楼: Originally posted by chineserice at 2012-06-14 01:56:53
奇了怪了~ 当时我检查没有符号颜色提示。
不好意思，还有不少问题，我要变成分数形式怎么调整，因为这个是超级计算机计算用，对精度要求很高，一般都是双精度~
还有就是0. + (1. (-1. ((0. xi - 1. xim1) (-0.5 ...

用Simplify或者FullSimplify试试看能不能获得你想要的结果
如果你在其他计算机上也用mathematica的话，不必考虑数据精度问题，mathematica中也没有数据类型啊，除非你用fortran。
用fortran的话还真得琢磨下分子分母的数量级，否则舍入误差是个问题。要是没有太大问题的话，把表达式直接用FortranForm[expr]，再输出文本，copy进fortran就差不多可以了，省得再type一遍。
0.就当作是0就可以了，这是mathematica的特殊癖好之一。
输出用Write呀，比如说要输出y1,y2随t的变化，那就Write[strm,t,y1,y2]，再对这个语句作Do循环不就行了。不知道是不是准确理解了你的问题

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4楼2012-06-14 11:13:34

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