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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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* |$ e- J0 p' M, T6 f<TD width=*><B>于ode32用法的求助</B></TD>
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<>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>
; o8 e3 b! G5 O% i<>1.  function xp=harm(t,x);# y" o7 E% |, E, J  D* B+ V+ ?
2.  k=2*pi;+ l$ P5 C0 I6 A, v( M
3.  xp(1)=x (2);. ^( U8 B; B# }& H
4.  xp(2)=-k*k*x (1);</P>* I; w3 W, P" b" b5 c( L$ ~$ d3 F
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&gt;&gt; [t,x]=ode23(harm,0,1,[0 2*pi])
+ o) |7 N# G% p2 x# N2 o& \( g4 @??? Input argument 'x' is undefined.</P>' T( T, `8 i  i( w5 a0 h
<>Error in ==&gt; D:\matlabtest\harm.m
  F1 S, i+ x; X) W, [2 BOn line 3  ==&gt; xp(1)=x(2); </P>
2 b* d; x' w9 ?0 r<>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>& z# O, I& Y6 Z/ E
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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>; M3 T" k; b! l3 l
<TD class=tablebody1 vAlign=center width=*>欢迎大家作客“矩阵工作室” 0 s! j7 t2 Z# H: l* j& }
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<>[t,x]=ode23('harm',0,1,[0,2*pi])</P>" E/ L4 N4 r! ]; B
<>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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