NAG FL Interface
x02ahf (sinarg_​max)

x02ahf returns the largest positive argument for which the Fortran intrinsic functions SIN and COS return a result with some meaningful accuracy.

The routine may be called by the names x02ahf or nagf_machine_sinarg_max.

The trigonometric functions $\sin$ and $\cos$ supplied in some compiler run-time libraries do not return accurate results when their argument is large. Often the related accuracy of a result gets progressively worse as the argument gets larger. x02ahf gives a value beyond which the compiler run-time library returns results with no relative accuracy at all. Note that some run-time libraries do return accurate results for all arguments to $\sin$ and $\cos$.

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x02ahf is not threaded in any implementation.

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See Section 10 in x02ajf.