[問題] 一個簡單的微分方程轉換已回收
我們只是簡單初學者 用簡單的指令算
雖然有上助教課 但是助教給的公式 怎麼try都錯誤
ps 不是計概課or程式課
(d^2)/(dt^2) + (dx)/(dt) + x = 1
x(0) = x'(0) = 0
我手邊沒課本題目 只有一小題的 條件
如果這要用dsolve解
就這樣嗎 dsolve('D2x+2*Dx+x=1','x(0)=0','Dx(0)=0')
ans =
1 - t/exp(t) - 1/exp(t)
助教給的方式是這樣
eq='d2x+2*dx+x=1'
ini='x(0)=0','dx(0)=0'
dsolve('eq,ini')
Error using ==> dsolve at 126
Can not use D as a variable in DSOLVE.
錯這樣 我也看不懂
有請大大幫解 orz
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