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ode32用法的求助

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电梯直达

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发表于 2005-4-12 15:41 |只看该作者 |倒序浏览

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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>
<

>1.  function xp=harm(t,x);
2.  k=2*pi;
3.  xp(1)=x (2);
4.  xp(2)=-k*k*x (1);</P>
<

>
>> [t,x]=ode23(harm,0,1,[0 2*pi])
??? Input argument 'x' is undefined.</P>
<

>Error in ==> D:\matlabtest\harm.m
On line 3 ==> xp(1)=x(2); </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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<TD class=tablebody1 vAlign=center width=*>欢迎大家作客“矩阵工作室”
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<

>[t,x]=ode23('harm',0,1,[0,2*pi])</P>
<

>运行后提示必须返回一个列向量</P></TD></TR></TABLE></BLOCKQUOTE></TD></TR></TABLE>

zan