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<TD width=*><B>于ode32用法的求助</B></TD>
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< >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>
A0 X/ Y" ]$ U% p: @- v2 z < >1. function xp=harm(t,x);
; N, k, U6 o- v7 z4 r 2. k=2*pi;
, |7 m2 l2 [) |8 L 3. xp(1)=x (2);
8 q' [7 F* h( ~' S2 I ?3 T# _' B8 e 4. xp(2)=-k*k*x (1);</P>1 r0 b- O$ d. f+ N) h
< >
3 S9 s9 z: Q1 i) ? >> [t,x]=ode23(harm,0,1,[0 2*pi]); W L+ ~, G9 i V: s- n/ d4 F
??? Input argument 'x' is undefined.</P>, v" j4 L6 \ x2 r4 i
< >Error in ==> D:\matlabtest\harm.m7 M7 ]: }+ O" |& ~; N" L( x
On line 3 ==> xp(1)=x(2); </P>
" y* J" }8 ]6 f8 ?& U < >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>/ `& S9 C3 i/ z2 X* T
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! b. E$ Q1 V" c- ? < >[t,x]=ode23('harm',0,1,[0,2*pi])</P>& Y! q/ s" g( G
< >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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