i have a proplem with some matrix

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

Answer 1

[Geoff Hayes]

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]

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]

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.