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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% c( J7 z& e! [3 J9 i1 w. K<>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>
<>1.  function xp=harm(t,x);
2.  k=2*pi;
3.  xp(1)=x (2);
4.  xp(2)=-k*k*x (1);</P>
2 D0 {8 c/ k( W' [2 l' |<>
8 N. R8 ^, i' a; F&gt;&gt; [t,x]=ode23(harm,0,1,[0 2*pi])
1 f) W' W1 T. {! _+ `2 S7 ~+ u??? Input argument 'x' is undefined.</P>
4 Q" e2 X" u$ m' n<>Error in ==&gt; D:\matlabtest\harm.m
8 v; Z$ _, ?3 d" f7 ]3 }On line 3  ==&gt; xp(1)=x(2); </P>
& E8 M; D3 E8 A<>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,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>