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* [1 N8 a* N1 P$ g. U: C) b <TD width=*><B>于ode32用法的求助</B></TD>
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( c3 t# q, k+ Z; a N, \% _+ g < >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>
" F! h j. n6 _% n6 A < >1. function xp=harm(t,x);3 Z& e! A2 H9 U& ^
2. k=2*pi;
# `" b2 A0 j' ?- I5 C3 l Z 3. xp(1)=x (2);
; z6 W" S; y$ _( j% z 4. xp(2)=-k*k*x (1);</P>
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>> [t,x]=ode23(harm,0,1,[0 2*pi])
. @2 ~2 H4 A& I4 R0 } ??? Input argument 'x' is undefined.</P>: z/ ]" q, F6 Y0 p8 C7 k0 H. S
< >Error in ==> D:\matlabtest\harm.m
+ i& v+ h/ b4 @$ r" {& _6 J8 F On line 3 ==> xp(1)=x(2); </P>
8 A9 m$ [# V$ E* L' U1 a < >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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$ v% s. ]. j- A) e <TD class=tablebody1 vAlign=center align=middle width=175><a href="http://www.madio.net/bbs/look_ip.asp?boardid=87&userid=11201&ip=*.*.*.*&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>2 ~9 _* e+ g8 M7 @5 y* [0 w5 E% u
<TD class=tablebody1 vAlign=center width=*>欢迎大家作客“矩阵工作室”
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4 d, a/ u4 V6 X$ H* w < >[t,x]=ode23('harm',0,1,[0,2*pi])</P>
; D& j2 M& b5 N# D& T% q6 a < >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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