How do I solve for column vector from a matrix

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Suma 2014-3-6

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回答： Jos (10584) 2014-3-7

Hello,

I want to find column matrix [a1 a2]'

[a1 a2]'*[a1 a2] = [1 0; 1 0];

how do I do that?

thanks

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Suma 2014-3-6

notice that [a1 a2]' is a column vector and [a1 a2] a row vector which are being multiplied

Matt J 2014-3-6

编辑：Matt J 2014-3-6

Yep. In addition to being symmetric, the left hand side expression is also rank 1. That means the right hand side would at least have to have those same properties.

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Jos (10584) 2014-3-7

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在 MATLAB Online 中打开

(1) [a ; b] * [a b] = [a*a a*b ; b*a b*b] % by definition
(2) [a ; b] * [a b] = [1 0 ; 1 0]  % by request
=> b*b = 0 => b is 0    
   b*a = 1 => b is not 0

Impossible!