The provided MATLAB command `B = A.^2` efficiently computes the element-wise square of each element in the matrix `A` and assigns the result to matrix `B`.`
``matlab
B = A.^2;
```
The `.^` operator in MATLAB performs element-wise exponentiation. By using `A.^2`, each element of matrix `A` will be squared individually, resulting in a matrix `B` with the squares of each element of `A`.
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