i have a proplem with some matrix

Question

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how can i get [10 0;0 10] and [-10 0 ;0 -10] from squre root of [100 0;0 100] ali

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显示 -2更早的评论隐藏 -2更早的评论

Answer 1

Geoff Hayes 2014-12-23

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Ali - if you assume that all elements in your matrix are positive, then you could use the sqrt function as

 A  = [100 0 ; 0 100];
 R1 =  sqrt(A);
 R2 = -sqrt(A);

ali 2014-12-23

编辑：ali 2014-12-23

in this case i should have two result , but in case A.1/3 i should have 3 results ,and what if they are negitive ?

Answer 2

mohammad 2014-12-23

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You can use this

A  = [100 0 ; 0 100];
syms B
solve('B*B-A')

this gives you two answers and if arrays of A are negative, there will be no problem.