作者laiyoyo (赖嘎嘎)
看板MATLAB
标题[讨论] 出现??? Undefined function or method '
时间Tue Dec 9 23:49:35 2014
一直出现??? Undefined function or method 'dsolve' for input arguments of type
'char'
这是我得输入
m=1;
c=1;
k=29;
t=0:0.01:2*pi;
y=dsolve('D2y+1*Dy+29*y','y(0)=3,Dy(0)=-1')
y=subs(y)
plot(t,y,'b')
hold on
m=0.5
y=dsolve('D2y+1*Dy+27*y','y(0)=3,Dy(0)=-1')
y=subs(y)
plot(t,y,'g')
hold on
m=1.5
y=dsolve('D2y+1*Dy+28*y','y(0)=3,Dy(0)=-1')
y=subs(y)
plot(t,y,'k')
hold on
m=2
y=dsolve('D2y+1*Dy+29*y','y(0)=3,Dy(0)=-1')
y=subs(y)
plot(t,y,'r')
hold on
m=2.5
y=dsolve('D2y+1*Dy+29*y','y(0)=3,Dy(0)=-1')
y=subs(y)
plot(t,y,'b')
hold on
m=3
y=dsolve('D2y+1*Dy+29*y','y(0)=3,Dy(0)=-1')
y=subs(y)
plot(t,y,'c')
麻烦各位大神帮忙
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1F：推 moandmo726: 我也是一样问题...，你的dsolve也是C/C++ function吗? 12/09 23:56
2F：→ moandmo726: 或着是mexFunction()? 12/09 23:58
3F：推 windg: dsolve是Symbolic Math Toolbox的函式 可以先看看你有没有 12/13 11:35
4F：→ windg: 这个toolbox 12/13 11:35
5F：→ windg: >>ver 12/13 11:36
6F：→ windg: >>which -all dsolve 12/13 11:36