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Symbolic solution to a system of equations

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Aleem Andrew
Aleem Andrew 2020-4-1
评论： Altug Bilge 2020-11-21
Can Matlab solve a system of equations like a+b=c, b=2c symbolically for b and c? The output should be c=-a, b=-2a

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Ameer Hamza
Ameer Hamza 2020-4-1
编辑：Ameer Hamza 2020-4-1
In MATLAB you solve it like this using symbolic variables and solve function()
syms a b c
eq1 = a+b==c;
eq2 = b==2*c;
sol = solve([eq1 eq2])
Result:
>> sol.b
ans =
-2*a
>> sol.c
ans =
-a
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Ameer Hamza
Ameer Hamza 2020-11-11
You can use subs() function
b_val = subs(sol.b, a, 5); % substitute a=5

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更多回答（1 个）

David Hill
David Hill 2020-4-1
syms a;
[1,-1;2,-1]\[a;0];

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