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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>- R9 }; F& e- k* n
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; D+ Z. [6 G2 }3 P; Z! M<>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>
7 c4 b- w8 m3 Q1 D% x) S<>1.  function xp=harm(t,x);
4 u8 w# N9 Z: f. P. J0 z" K# u; V2.  k=2*pi;
( M3 U% G' x- X9 }0 Z. U: `" X2 ^3.  xp(1)=x (2);! z# [' a% B, _6 @! {! P
4.  xp(2)=-k*k*x (1);</P>
" L) J- F$ |0 R7 V/ l<>
8 G* @7 k. W3 U; k&gt;&gt; [t,x]=ode23(harm,0,1,[0 2*pi]), ]% Q1 e! m6 \4 `0 w  g0 e
??? Input argument 'x' is undefined.</P>. b3 N9 ~: s. l
<>Error in ==&gt; D:\matlabtest\harm.m
( f( o; s+ y8 QOn line 3  ==&gt; xp(1)=x(2); </P>7 T+ M1 N$ A* y- K8 ]  K6 t
<>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>- y8 o2 t6 _) V& i
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<TD class=tablebody1 vAlign=center width=*>欢迎大家作客“矩阵工作室” " A+ D# s' |/ X$ k9 L
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# }/ Z! ]+ y5 r2 E8 ^  c6 n) k<>[t,x]=ode23('harm',0,1,[0,2*pi])</P>+ l/ z" n& m) }2 |
<>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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