ode32用法的求助

21101244

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<TD width=*><B>于ode32用法的求助</B></TD>
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8 o8 `" |" y, j. L5 x<>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>
& |" B2 i! ]3 c% n3 e# t<>1.  function xp=harm(t,x);
% j9 `6 z6 B  y9 I$ v( L3 G2.  k=2*pi;
1 L% f; o3 D( v2 b3 \* Y3.  xp(1)=x (2);
- {3 O/ m- H/ K5 s9 s4.  xp(2)=-k*k*x (1);</P>
<>
&gt;&gt; [t,x]=ode23(harm,0,1,[0 2*pi])
, x9 o; X; R4 Q2 s) _& n??? Input argument 'x' is undefined.</P>
<>Error in ==&gt; D:\matlabtest\harm.m
- E6 M0 g$ v; h: ~/ A% k* N' `: fOn line 3  ==&gt; xp(1)=x(2); </P>
/ q- K2 L' @* T* N) G<>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>
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, G+ G: _! |6 q, d4 y! }; e$ R<TD class=tablebody1 vAlign=center align=middle width=175><a href="http://www.madio.net/bbs/look_ip.asp?boardid=87&amp;userid=11201&amp;ip=*.*.*.*&amp;action=lookip" target="_blank" ><IMG src="http://www.madio.net/bbs/Skins/Default/ip.gif" align=absMiddle border=0></A> 2005-4-12 13:14:36</TD>
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" X) |& c/ e6 u) x1 {
<>[t,x]=ode23('harm',0,1,[0,2*pi])</P>
) B9 O. Q9 `0 Z! e9 D<>运行后提示必须返回一个列向量</P></TD></TR></TABLE></BLOCKQUOTE></TD></TR></TABLE>