getting the error in solving non linear equations

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sunitha
sunitha 2021-3-24
回答： sunitha 2021-3-24
This is the error i am getting , i didnt understand what that error means . The error is showing in S(i)=vpasolve([eqn1,eqn2],[N,J]);
can u help me
Error using sym.getEqnsVars>checkVariables (line 92)
Second argument must be a vector of symbolic variables.
Error in sym.getEqnsVars (line 56)
checkVariables(vars);
Error in sym/vpasolve (line 132)
[eqns,vars] = sym.getEqnsVars(varargin{1:N});
Error in Untitled (line 46)
Solutions{i}=vpasolve([eqn1,eqn2],[N,J]);

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回答（2 个）

KSSV
KSSV 2021-3-24
You have to show us the full code to get a straight help. Without ocde it gets difficult for people to understand what exactly is the problem.
I suspect that, in this line:
Solutions{i}=vpasolve([eqn1,eqn2],[N,J]);
is N, J are symbolic variables? I think not in your case and this is the reason for your error. N, J should be symbolic variables which you are truing to solve in eqn1 and eqn2.
If this is not the case, show us your full code.
sunitha
sunitha 2021-3-24
Now i am not getting any error but i am getting the wrong values.i dont know where i did mistake using the data first i have to find V value using that V value again i have to find out the N J values
The first code is to find the v value
The second code is to find the N J variables
The problem is i am getting the same value 4 even if change the another variables also i am getting the same result
can u please tell me what is the problem with this code? i am trying from the last two days

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