naginterfaces.library.machine.sinarg_​max

naginterfaces.library.machine.sinarg_max()

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

For full information please refer to the NAG Library document for x02ah

https://support.nag.com/numeric/nl/nagdoc_30/flhtml/x02/x02ahf.html

Returns

maxscfloat

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

Notes

The trigonometric functions $\text{sin}$ and $\text{cos}$ 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. sinarg_max 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 $\text{sin}$ and $\text{cos}$.