Warning: The number of equations exceeds the number of indeterminates. Trying heuristics to reduce to square system.

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Archit Asthana 2018-6-24

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https://ww2.mathworks.cn/matlabcentral/answers/407101-warning-the-number-of-equations-exceeds-the-number-of-indeterminates-trying-heuristics-to-reduce-t

评论： Walter Roberson 2018-7-6

here is my code:

     %enter code here
     vo=550;
     Lk=1e-3;
     C=3e-9;
     c=3e-9;
     syms  vc1(t) vc2(t) il(t) ic1(t)
     equ1 = vc1 + vc2 - vo == 0;
     equ2= Lk * diff(il , t)- vc1 == 0;
     equ3 = ic1 == c * diff ( vc1 , t );
     equ4 = il +ic1 ==c *diff (vc2 , t );
     cond = [vc1(0) == vo , vc2(0) == 0, il(0)==0, ic1(0) == 0];
     [svc1(t), svc2(t) ] = dsolve ([equ1 , equ2 , equ3 , equ4 ], cond )

I am getting this repeated error.

Thanking in anticipation.

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madhan ravi 2018-7-6

It happened to me once but when I didn’t use the intial co diction it worked . Try doing it or check the initial condition.

Walter Roberson 2018-7-6

Yes, when I was working it through on Maple, Maple could not find the solution when I gave the initial conditions. I had to ask for the general solution and then use my knowledge of the initial conditions to pin down the values of the constants of integration.

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