Kahan, W., “Branch Cuts for Complex Elementary Functions, or Much Ado About Nothing’s Sign Bit”, The State of the Art in Numerical Analysis, (Eds. ![]() ISO/IEC 9899: Programming language C (All revisions).ISO/IEC 14882: Programming Language C++ (All revisions).IEEE Computer Society (2008), IEEE Standard for Binary Floating-Point Arithmetic.Sign of the real part of argument defines the sign of in result. ‡Logarithmic form of gives expression for function values along branch cut: ![]() ![]() This is super strange since it provides access to hardware floats and such basic functions have been implemented with correct handling of branch cuts for decades (e.g. Unfortunately MATLAB ignores signed zeros in _all_ inverse trigonometric functions, sqrt, log and power (and apparently in special functions).
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