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<TR> 2 Q6 s) @6 a; x. H3 f) X% |+ H<TD width=*><B>于ode32用法的求助</B></TD>. _( o7 k8 Y1 q+ P1 v. \* u
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# w: A$ r# @9 O7 y<>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> ' k, e' ]5 t$ } s K3 O<>1. function xp=harm(t,x); / p1 a' E$ }7 c" p2 Y7 N3 x9 _2. k=2*pi;, [( c2 Z" Z" g& L
3. xp(1)=x (2); * _" L4 z& m( M4 t7 @4. xp(2)=-k*k*x (1);</P>* c0 ~# } L: H1 [5 B
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>> [t,x]=ode23(harm,0,1,[0 2*pi])4 p# t. k5 H. m5 m# X
??? Input argument 'x' is undefined.</P> . K( Z0 V( G9 v; S$ H3 L: c<>Error in ==> D:\matlabtest\harm.m7 C$ a" F3 e- ]1 V
On line 3 ==> xp(1)=x(2); </P> o& u. v( K: m, B
<>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> 9 ~: p) z q3 d1 I& M% ]' T8 e<TR>, q. L H& b* o
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<>[t,x]=ode23('harm',0,1,[0,2*pi])</P> 1 _" G1 |2 U. C& d<>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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发表于 2005-4-12 15:41
>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>
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