求解一个具有自由度的符号方程组

Question

我正在尝试求解一个具有自由度的符号系统。它应该使用参数，但是它不能处理一些简单的东西，比如:

syms x1 x2 x3 x4 x5 x6 x7 x8 real
con = [
x1 + x2 + x3 + x4 + x5 + x6 + x7 + x8 == 1080
x2 + x3 == 0
x6 + x7 == 0
];
s = solve(con, 'ReturnConditions', 1 ,'PrincipalValue', true)

输出:

Warning: Unable to find explicit solution. For options, see help. 
> In solve (line 317)
In testm (line 10)
In run (line 91) 
s = 
struct with fields:
x1: [0×1 sym]
x2: [0×1 sym]
x3: [0×1 sym]
parameters: [1×0 sym]
conditions: [0×1 sym]

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Lucien的解决方案也适用于此:

求解整数变量符号方程

Answer 1

也许它能帮到你。

s = solve(con, [x1 x2 x3 x4 x5 x6 x7 x8], 'ReturnConditions', 1 ,'PrincipalValue', true);