SQRT function
Description
SQRT(x) returns the square root of the positive number x. SQRT(x)=x^(1/2). If the argument x of the function is negative, then the function returns an error (missing value).
The argument x can be a real number, a complex number, or a matrix. When it is a matrix, the function returns a matrix with the same dimensions and with the SQRT function applied to all elements.
Example
SQRT(25) equals 5
SQRT(-9) returns an error (no value).