i have a proplem with some matrix

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ali
ali 2014-12-23
回答： mohammad 2014-12-23
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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回答（2 个）

Geoff Hayes
Geoff Hayes 2014-12-23
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);
  1 个评论
ali
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 ?

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mohammad
mohammad 2014-12-23
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.

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