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>
$ A* L" G* s* N3 K) D/ I) P4 g+ f<>1.  function xp=harm(t,x);
2.  k=2*pi;
$ T( ~/ w) \! i& a) B1 q6 p# T3.  xp(1)=x (2);
, n; k+ V8 ?$ X0 O* |4.  xp(2)=-k*k*x (1);</P>
<>
&gt;&gt; [t,x]=ode23(harm,0,1,[0 2*pi])
??? Input argument 'x' is undefined.</P>
<>Error in ==&gt; D:\matlabtest\harm.m
. I$ k! |- J/ F8 w2 F- JOn line 3  ==&gt; xp(1)=x(2); </P>
6 J$ @) b/ |% W+ k4 h" g/ t<>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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! }- T* Z$ N- E<>[t,x]=ode23('harm',0,1,[0,2*pi])</P>
<>运行后提示必须返回一个列向量</P></TD></TR></TABLE></BLOCKQUOTE></TD></TR></TABLE>