matrix and system equation

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Th
Th 2020-9-30
评论： John D'Errico 2020-9-30
Can I convert matrix to system equation?If I want to input matrix A=[4 -4 0;2 3 5;3 5 7] X=[x1;x2;x3] B=[4;5;6]

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回答（2 个）

Ameer Hamza
Ameer Hamza 2020-9-30
编辑：Ameer Hamza 2020-9-30
If you have the symbolic toolbox, then do it like this
A=[4 -4 0;2 3 5;3 5 7]; B=[4;5;6];
syms x [3 1]
eqs = A*x == B;
Result
>> eqs
eqs =
4*x1 - 4*x2 == 4
2*x1 + 3*x2 + 5*x3 == 5
3*x1 + 5*x2 + 7*x3 == 6
and If you just want to find the solution of x, then run
x = A\B;
Result
>> x
x =
-0.2000
-1.2000
1.8000
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Th
Th 2020-9-30
Please help me again.I try to code the program but it's error.
Ameer Hamza
Ameer Hamza 2020-9-30
编辑：Ameer Hamza 2020-9-30
There should be a space between variable name and size
syms x [q,1]
also, the recommended functional-based syntax is
x = sym('x', [3 1])

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Th
Th 2020-9-30
Thank you so much!
  1 个评论
John D'Errico
John D'Errico 2020-9-30
Please don't use an answer to make a comment. Use comments for that purpose.

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