ode32用法的求助

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0 x' n) Q( r, J* _2 W6 j<TD width=*><B>于ode32用法的求助</B></TD>
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5 o6 R. m% z8 D! T+ Z<>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;
% J! t8 l" }0 h* c1 x* J. d3.  xp(1)=x (2);
1 M' y* P& N! v( Z4.  xp(2)=-k*k*x (1);</P>
<>
; @8 H& y$ p; Z&gt;&gt; [t,x]=ode23(harm,0,1,[0 2*pi])
; i* L7 A! _& j??? Input argument 'x' is undefined.</P>
0 U, b6 ^. X3 s<>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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<TD class=tablebody1 vAlign=center align=middle width=175><a href="http://www.madio.net/bbs/look_ip.asp?boardid=87&amp;userid=11201&amp;ip=*.*.*.*&amp;action=lookip" target="_blank" ><IMG src="http://www.madio.net/bbs/Skins/Default/ip.gif" align=absMiddle border=0></A> 2005-4-12 13:14:36</TD>
<TD class=tablebody1 vAlign=center width=*>欢迎大家作客“矩阵工作室”
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( {2 ]8 F# `  s' c1 d  N<>[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>