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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$ Q! }$ L& K, I$ E! y2 E* C/ r<>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>
" a4 J4 C- i$ A5 ?: ~& _: U<>1.  function xp=harm(t,x);
2.  k=2*pi;
3.  xp(1)=x (2);
4.  xp(2)=-k*k*x (1);</P>
<>
&gt;&gt; [t,x]=ode23(harm,0,1,[0 2*pi])
* o8 Q8 y2 \7 @??? Input argument 'x' is undefined.</P>
, K, _- x& ^* i, E$ Y<>Error in ==&gt; D:\matlabtest\harm.m
* R# g6 r8 f6 XOn line 3  ==&gt; xp(1)=x(2); </P>
$ ^  c$ C+ q7 z<>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>
$ v: k" e" W! x<>运行后提示必须返回一个列向量</P></TD></TR></TABLE></BLOCKQUOTE></TD></TR></TABLE>