
The value of the result is an approximation to the square root of X.
Like many intrinsic functions, this is elemental; the result has the same shape as X, with the operation being applied elementwise.
If X is of type Real, it must be greater than or equal to zero.
If X is of type Complex, the result is the principal value with the real part nonnegative; if the real part of the result is zero, the imaginary part of the result has the same sign as the imaginary part of X.

