g77.info: Abs Intrinsic

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Abs Intrinsic

Abs(A)

Abs: `INTEGER' or `REAL' function.  The exact type depends on that of
argument A--if A is `COMPLEX', this function's type is `REAL' with the
same `KIND=' value as the type of A.  Otherwise, this function's type
is the same as that of A.

A: `INTEGER', `REAL', or `COMPLEX'; scalar; INTENT(IN).

Intrinsic groups: (standard FORTRAN 77).

Description:

   Returns the absolute value of A.

   If A is type `COMPLEX', the absolute value is computed as:

     SQRT(REALPART(A)**2+IMAGPART(A)**2)

Otherwise, it is computed by negating A if it is negative, or returning
A.

   *Note Sign Intrinsic::, for how to explicitly compute the positive
or negative form of the absolute value of an expression.