ode32用法的求助

21101244

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! p7 |( `, H( Q  N+ [0 ~<TD width=*><B>于ode32用法的求助</B></TD>
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- e" q3 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>
/ E3 q5 X3 x/ w$ A$ `: W6 U+ j<>1.  function xp=harm(t,x);
+ L4 W  f/ {2 |% M" ~2.  k=2*pi;
3.  xp(1)=x (2);
5 E( U$ p2 F& {! _( H% N: k4.  xp(2)=-k*k*x (1);</P>
( Z8 e4 P5 y9 Q  L$ b$ h<>
- v7 x' a3 R: {; e) V- a&gt;&gt; [t,x]=ode23(harm,0,1,[0 2*pi])
??? Input argument 'x' is undefined.</P>
<>Error in ==&gt; D:\matlabtest\harm.m
1 }" B, T  r' B% X7 TOn 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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4 @  O. V/ Y5 O+ N$ A4 b1 Y<>[t,x]=ode23('harm',0,1,[0,2*pi])</P>
1 x1 k6 \0 w# N: V<>运行后提示必须返回一个列向量</P></TD></TR></TABLE></BLOCKQUOTE></TD></TR></TABLE>