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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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8 k. U" m4 W5 e! G: C<TD width=*><B>于ode32用法的求助</B></TD>0 c0 ]4 ]+ i, ]1 @; ?( O
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; R0 D* z- \+ h7 n( N: `- a3 j# r4 ^<>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>
% _/ `. L! @1 J+ H1 \9 |( L<>1.  function xp=harm(t,x);) _0 @6 P$ W6 e& T! C) H+ \. I
2.  k=2*pi;: o9 m) O# W* X! o" R
3.  xp(1)=x (2);
9 v* @- ~" y! T2 F. b6 F4.  xp(2)=-k*k*x (1);</P>
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% |; h, Y. [  X0 H$ n3 H" N, R% v&gt;&gt; [t,x]=ode23(harm,0,1,[0 2*pi])
- y# z. A  M# a2 e3 y??? Input argument 'x' is undefined.</P>
: N4 Y5 S0 q! K. w<>Error in ==&gt; D:\matlabtest\harm.m
5 M4 M5 g$ R. w/ oOn line 3  ==&gt; xp(1)=x(2); </P>- p& f6 D" h; t' g
<>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>7 n8 q4 V1 c3 E
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6 I! P, o0 w) R7 [% ~<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>
: h) b+ k  o' r% W0 H3 S<TD class=tablebody1 vAlign=center width=*>欢迎大家作客“矩阵工作室”
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<>[t,x]=ode23('harm',0,1,[0,2*pi])</P>
2 u) A; |1 ~3 S% _<>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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