Compiler Library/XL Reference Manual (32650-90029)

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Attributes

Parameter: A non-negative real number.

Result: A non-negative real number.

HP FORTRAN 77/XL: Intrinsic function: Y=SQRT(X).

Error: If the argument is a NaN or if it is negative,

there are two possible actions. If the INVALID

trap is enabled, the message "SQRT(X): X<0.0 OR

X=NaN" occurs. Otherwise, the INVALID flag is

set. In either case, a quiet NaN is returned.

TAN (or TAN')

TAN calculates the tangent of a real number in radians.

Declaration

FUNCTION TAN(VAR x:REAL):REAL; EXTERNAL;

Accuracy

Attributes

Parameter: A real number in radians.

Result: A real number.

HP FORTRAN 77/XL: Intrinsic function: Y=TAN(X)

Error: If the argument is a NaN, there are two

possible actions. If the INVALID trap is

enabled, the message "TAN(X): X=NaN" occurs.

Otherwise, the INVALID flag is set. In either

case, a quiet NaN is returned.

When ABS(X) > 6433.0, TAN(X) completely loses

significance. See Appendix A for more details.

TANH (or TANH')

TANH calculates the hyperbolic tangent of a real number.

Declaration

FUNCTION TANH(VAR x:REAL):REAL; EXTERNAL;

When x-y ~ ∈ , maximum f-g ~ ∈ sec