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标题: ode32用法的求助 [打印本页]
作者: 21101244    时间: 2005-4-12 15:41
标题: ode32用法的求助
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<TD width=*><B>于ode32用法的求助</B></TD>
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<>在求解常微分方程X"(t)+k^2*X=0的过程中遇到的问题,很是郁闷!!!!!!!</P>0 ~6 Q+ z- N" ~) M0 R- o6 \- J
<>1.  function xp=harm(t,x);3 ?" g! x6 W5 u, x+ a% ~4 r+ Q0 t
2.  k=2*pi;
/ x0 `9 l( G: j; T4 l' s3.  xp(1)=x (2);
8 S: Y9 K; V: c4 y4 j5 O4.  xp(2)=-k*k*x (1);</P>
% ?6 g9 e: ]! Q' s0 V/ J<>
* r* y( v, l/ h2 z, w3 `8 a0 L) x&gt;&gt; [t,x]=ode23(harm,0,1,[0 2*pi])
0 z2 t( a, x4 I2 N??? Input argument 'x' is undefined.</P>
- C1 M) L( `$ X( G<>Error in ==&gt; D:\matlabtest\harm.m
- S$ i1 q3 d2 O5 [8 y* SOn line 3  ==&gt; xp(1)=x(2); </P>
9 A3 e: Z: ]; R- V) X8 D- `<>总是提示”输入参数X未被定义”,可是很多书上都是这么写的可以求出来树枝解,恳求各位大侠指点!!</P></TD></TR></TABLE></BLOCKQUOTE></TD></TR>9 v# e  l$ k2 S7 [+ \) f* O
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<TD class=tablebody1 vAlign=center width=*>欢迎大家作客“矩阵工作室” 9 J0 g6 V0 N6 F% q
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9 G) u: U  @/ x( o6 X<>[t,x]=ode23('harm',0,1,[0,2*pi])</P>
) O% Z: T4 [( V1 q; ^<>运行后提示必须返回一个列向量</P></TD></TR></TABLE></BLOCKQUOTE></TD></TR></TABLE>



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