HP 3000 Manuals

Compiler Library/XL Reference Manual

SIGN (or SIGN') 

SIGN calculates the absolute value of the first real number and gives the
number the sign of the second real number.

Declaration 

        FUNCTION SIGN(x,y:REAL):REAL; EXTERNAL;

Attributes 

Parameters:               Both arguments are real numbers; if the second
                          number is zero, the sign is assumed to be
                          positive.

Result:                   A real number.

HP FORTRAN 77/XL:         Intrinsic function:  Z=SIGN(X,Y).

Error:                    If either of the arguments is a NaN, there are
                          two possible actions.  If the INVALID trap is
                          enabled, the message "SIGN FUNCTION: ANY
                          ARGUMENT=NaN" occurs.  Otherwise, the INVALID
                          flag is set.  In either case, a quiet NaN is
                          returned.

MPE/iX 5.0 Documentation