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標題: 請會 matlab的大大幫我 [列印本頁]

作者: doiii 時間: 2010-9-27 21:43:57 標題: 請會 matlab的大大幫我

我想問一下 matlab 的反拉式轉換和拉式轉換的指令

F(s)= 1/ s^2+2s+1
反拉氏結果為何??

本身matlab不太行
請大大回復的時候詳細一點!! 謝謝

作者: huyoho2000 時間: 2010-9-27 23:12:47

拉氏轉換:laplace(F)
反拉式轉換:ilaplace(F)

直接執行

>>syms F S
>>F=1/(S^2+2*S+1)
>>ilaplace(F)

應該會得到:t*exp(-t)

作者: doiii 時間: 2010-9-27 23:36:59

大大我剛複製一下你給的指令好像有錯喔變數好像有問題 = =

作者: doiii 時間: 2010-9-27 23:41:52

sor 剛是我腦幹 !沒空格,可是答案為啥是t*exp(-t) 不是ASINWT+BCOSWT?? 怎樣打指令他才會把a w b 的數字顯示出來 ??

作者: doiii 時間: 2010-9-27 23:47:53

sor 我又看錯了我問錯題目了= = 原來我問大大ㄉ事 1/S*2+2s+1

作者: mike1207 時間: 2010-11-2 20:43:24 標題: 那位大大會MATLAB的，幫幫忙，感恩

OPTIMIZATION  METHODS  MID-TERM  EXAMINATION

1.將下列問題，列出其目標函數及限制條件

  a. Transportation problem ( minimize transportation cost)
m plants, n warehouse
s i  supply of  ith plant , i=1……..m

d j demand of jth warehouse, j=1….n

c ij cost of transportation i→j

x ij number of unite to send i→j

b. Manufacturing (maximize profit)
n products, m raw materials

c  j.:profit of product j

b i  :available units of material i

a i j :＃units of material  i  product j needs in order to be proced

x j :amount product j produced

c. Scheduling (Goal: hire minimum number of nurses)
Hospital wants to make weekly nightshift of its nurses

d  j : demand for nurses each day, j =1,2…,7

Every nurse works 5days in a row

X j :＃nurses starting their work on day  j

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