Empty sym: 0-by-1.

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Talal Salem
Talal Salem 2020-3-3
评论： Talal Salem 2020-3-5
Hi,
I'm trying to solve these four linear equation.
clear all;
clc;
syms a b c d e f g h z k l m n o p q v y
eqn1 = a == y*(b*c+d*e+f*g+h*z);
eqn2 = k == y*(d*c+l*e+m*g+n*z);
eqn3 = o == y*(n*c+f*e+p*g+q*z);
eqn4 = v == y*(n*c+f*e+p*g+q*z);
sol = solve([eqn1, eqn2, eqn3, eqn4], [c, e, g, z]);
cSol = sol.c
eSol = sol.e
gSol = sol.g
zSol = sol.z
When it's run I got the solution as
Empty sym: 0-by-1.
Could you help me in figuring out this issue?
Thanks in advance

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回答（1 个）

Walter Roberson
Walter Roberson 2020-3-3
>> sol1 = solve([eqn1,eqn2,eqn3],[c,e,g])
sol1 =
struct with fields:
c: [1×1 sym]
e: [1×1 sym]
g: [1×1 sym]
>> simplify(subs(eqn4,sol1))
ans =
v == o
Your equations are not independent; you cannot solve for all four of those particular variables at the same time.

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