How can I solve the linear system of equations with Matlab?

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Nghia
Nghia 2014-1-4
回答： Roger Stafford 2014-1-4
Hi everyone, I want to find a function to solve the linear system of equations n Matlab. For example, let's focus on this system of equations: x1+x2+2x3=0 x1+2x2-x3=0
Suppose that the answer is: x1=-a, x2=5a, x3=a. I want Matlab to show [-1 5 1]'
How can I do that? Please help me. Your help will be really appreciated. Thank you.

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回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2014-1-4
a=1;
x1=-a,
x2=5a,
x3=a
sol=[x1 x2 x3]
  2 个评论
Nghia
Nghia 2014-1-4
But I want when I enter the system of equation, it will show the [-1 5 1].
Azzi Abdelmalek
Azzi Abdelmalek 2014-1-4
I don't understand what you want. Please reformulate your question and make it clear

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Roger Stafford
Roger Stafford 2014-1-4
If your equations are homogeneous as in your example, you need to use matlab's 'null' function. See its documentation at:
http://www.mathworks.com/help/matlab/ref/null.html
In your example its solution would be
Z = null([1 1 2;1 2 -1]);
and the column vector Z would only be proportional to [-1 5 1] since it will have a norm of one.

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