ode32用法的求助

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2 [4 _/ ]  l4 ?) Y5 L* _<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>
" p8 f' ~6 N8 {- M6 P% |3 n<>1.  function xp=harm(t,x);
, D- R7 F1 b9 F1 Z! s2.  k=2*pi;
3.  xp(1)=x (2);
4.  xp(2)=-k*k*x (1);</P>
<>
4 S- x( \  u6 Y9 _3 k! U&gt;&gt; [t,x]=ode23(harm,0,1,[0 2*pi])
7 ?' t, c1 v' n2 Z) h??? Input argument 'x' is undefined.</P>
<>Error in ==&gt; D:\matlabtest\harm.m
3 W* k; B' t6 w, lOn line 3  ==&gt; xp(1)=x(2); </P>
<>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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' [6 v4 i' p& j; z
; Z8 t% K2 Y, J7 p<>[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>