ode32用法的求助

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( @6 r4 N# F3 F6 k8 P/ i5 s<TD width=*><B>于ode32用法的求助</B></TD>
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1 |" m0 |, j9 j# z5 \<>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>
# I3 L6 \1 w6 Y1 S<>1.  function xp=harm(t,x);
' ?9 k$ W" A& r# {5 u2.  k=2*pi;
3.  xp(1)=x (2);
4.  xp(2)=-k*k*x (1);</P>
5 ?% s# G! \$ X  M<>
$ w. i: C8 M5 e&gt;&gt; [t,x]=ode23(harm,0,1,[0 2*pi])
, `. U" }, g- r$ c) V4 [??? Input argument 'x' is undefined.</P>
- |! l" j) {( n8 l  u<>Error in ==&gt; D:\matlabtest\harm.m
On 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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4 p; g. {4 t2 z9 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>