21101244 发表于 2005-4-12 15:41

ode32用法的求助

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<TD width=*><B>于ode32用法的求助</B></TD>
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<P>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>
<P>1.  function xp=harm(t,x);
2.  k=2*pi;
3.  xp(1)=x (2);
4.  xp(2)=-k*k*x (1);</P>
<P>
&gt;&gt; =ode23(harm,0,1,)
??? Input argument 'x' is undefined.</P>
<P>Error in ==&gt; D:\matlabtest\harm.m
On line 3  ==&gt; xp(1)=x(2); </P>
<P>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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<P>=ode23('harm',0,1,)</P>
<P>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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