Aprahamian, Mary and Higham, Nicholas J. (2016) Matrix Inverse Trigonometric and Inverse Hyperbolic Functions: Theory and Algorithms. [MIMS Preprint]
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Abstract
Theoretical and computational aspects of matrix inverse trigonometric and inverse hyperbolic functions are studied. Conditions for existence are given, all possible values are characterized, and principal values $\acos$, $\asin$, $\acosh$, and $\asinh$ are defined and shown to be unique primary matrix functions. Various functional identities are derived, some of which are new even in the scalar case, with care taken to specify precisely the choices of signs and branches. New results include a ``round trip'' formula that relates $\mathrm{acos}(\cos A)$ to $A$ and similar formulas for the other inverse functions. Key tools used in the derivations are the matrix unwinding function and the matrix sign function. A new inverse scaling and squaring type algorithm employing a Schur decomposition and variabledegree Pad\'e approximation is derived for computing acos, and it is shown how it can also be used to compute asin, acosh, and asinh. In numerical experiments the algorithm is found to behave in a forward stable fashion and to be superior to computing these functions via logarithmic formulas.
Item Type:  MIMS Preprint 

Additional Information:  To appear in the SIAM Journal on Matrix Analysis and Applications 
Uncontrolled Keywords:  matrix function, inverse trigonometric functions, inverse hyperbolic functions, matrix inverse sine, matrix inverse cosine, matrix inverse hyperbolic sine, matrix inverse hyperbolic cosine, matrix exponential, matrix logarithm, matrix sign function, rational approximation, Pad\'{e} approximation, MATLAB, GNU Octave, Fr\'echet derivative, condition number 
Subjects:  MSC 2010, the AMS's Mathematics Subject Classification > 15 Linear and multilinear algebra; matrix theory MSC 2010, the AMS's Mathematics Subject Classification > 65 Numerical analysis 
Depositing User:  Nick Higham 
Date Deposited:  03 Aug 2016 
Last Modified:  20 Oct 2017 14:13 
URI:  https://eprints.maths.manchester.ac.uk/id/eprint/2491 
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Matrix Inverse Trigonometric and Inverse Hyperbolic Functions: Theory and Algorithms. (deposited 20 Jan 2016)
 Matrix Inverse Trigonometric and Inverse Hyperbolic Functions: Theory and Algorithms. (deposited 03 Aug 2016) [Currently Displayed]
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