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SqRt(X)
SqRt: REAL or COMPLEX function, the exact type being that of argument X.
X: REAL or COMPLEX; scalar; INTENT(IN).
Intrinsic groups: (standard FORTRAN 77).
Description:
Returns the square root of X, which must not be negative.
To calculate and represent the square root of a negative number, complex arithmetic must be used. For example, `SQRT(COMPLEX(X))'.
The inverse of this function is `SQRT(X) * SQRT(X)'.