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标题: ode32用法的求助 [打印本页]
作者: 21101244    时间: 2005-4-12 15:41
标题: 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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2 Z  }) t$ F" z6 W<>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>
  q9 y  a: [- F2 A; O<>1.  function xp=harm(t,x);- ?7 @3 P! u6 S& ~" ?* Q$ B3 r2 d
2.  k=2*pi;  j' H+ |# `: V4 H/ _3 F0 |
3.  xp(1)=x (2);
8 B8 {9 [0 a" o1 i, h4.  xp(2)=-k*k*x (1);</P>' }% \2 J& ?6 b7 |
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&gt;&gt; [t,x]=ode23(harm,0,1,[0 2*pi])
; G1 \! Q& u! `4 V' f??? Input argument 'x' is undefined.</P>
  m5 G; g' E4 e. \3 u3 G, |  V<>Error in ==&gt; D:\matlabtest\harm.m8 i' D: r* _3 R" d5 p, l+ c0 @# ^
On line 3  ==&gt; xp(1)=x(2); </P>) E. U8 F2 v7 A% C8 D' h9 {
<>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>( P1 T! h* V* y# o8 T
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) d, T" W( \! v  a: D<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>! y0 c2 e5 b! z2 \4 g  b+ \
<TD class=tablebody1 vAlign=center width=*>欢迎大家作客“矩阵工作室” : |) u. ^- ~0 G1 Z- U
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2 A2 b7 X% x- J8 E9 x; A) M<>[t,x]=ode23('harm',0,1,[0,2*pi])</P>3 O9 z' t- ?: @* r  r) U2 I, \
<>运行后提示必须返回一个列向量</P></TD></TR></TABLE></BLOCKQUOTE></TD></TR></TABLE>



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