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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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2 y8 h- I( ]8 s: Y3 Y<TD width=*><B>于ode32用法的求助</B></TD>, o5 D, U3 w4 v& Z" c
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1 W) o. o1 }2 E/ }% c# a<>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>- i9 p5 {* H7 A3 R- j
<>1.  function xp=harm(t,x);
8 p' Q' b! `8 k+ m1 ~% K2.  k=2*pi;8 R  c9 _# o* O3 S
3.  xp(1)=x (2);& y+ x% v2 {) u+ I8 A: n& \1 A
4.  xp(2)=-k*k*x (1);</P>6 n) Z8 W0 g4 H6 z
<>
( e' G. ?) L4 z- y1 e8 T- _4 B&gt;&gt; [t,x]=ode23(harm,0,1,[0 2*pi])" c, [/ Y% y; c! v: F
??? Input argument 'x' is undefined.</P>1 h4 w2 g, L2 c; `. I  X
<>Error in ==&gt; D:\matlabtest\harm.m
" d4 O1 B$ E9 ^* K! {0 iOn line 3  ==&gt; xp(1)=x(2); </P>4 y( v% n$ N" E& h+ D4 N/ W" ^- G) v
<>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>1 j9 Q& R3 \5 S+ W
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<TD class=tablebody1 vAlign=center width=*>欢迎大家作客“矩阵工作室” 7 B3 t& g5 Q0 X  ^( O" m
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1 ^* u: o: Q& S* ^8 `, O<>[t,x]=ode23('harm',0,1,[0,2*pi])</P>( p" H( r2 ~8 Z7 l( C5 Y
<>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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