Compiler Library/XL Reference Manual (32650-90029)

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Attributes

Parameter: A real number in radians.

Result: A representable real number in the range [-1.0,

1.0]. See Chapter 1 for details on the

internal representation of real numbers.

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

Error: If the argument is a NaN or an Infinity, there

are two cases. If the INVALID trap is enabled,

the message "COS(X): X=NaN OR INFINITY" occurs.

Otherwise, the INVALID flag is set. In either

case, a quiet NaN is returned.

COSH (or COSH')

COSH calculates the hyperbolic cosine of a real number.

Declaration

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

Accuracy

Attributes

Parameter: A real number.

Result: A real number.

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

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

possible actions. If the INVALID trap is

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

Otherwise, the INVALID flag is set. In either

case, a quiet NaN is returned.

If ABS(X) is >= 88.7196, the result cannot be

represented and the message "COSH(X) OVERFLOW"

occurs. See Appendix A for more details.

CSIN (or CSIN')

CSIN calculates the sine of a complex number.

Declaration

Complex numbers in HP FORTRAN 77/XL programs are represented as an

ordered pair of real numbers: one for the real part

and one for the

imaginary part

. Thus, complex numbers occupy eight bytes.

TYPE complex=RECORD

realpart:REAL;

imagpart:REAL;

END;

FUNCTION CSIN(VAR x:complex):complex; EXTERNAL;