NAG CL Interface
X02ANC (complex_​safe)

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1 Purpose

X02ANC returns the safe range of complex floating-point arithmetic.

2 Specification

#include <nag.h>
double  X02ANC
The function may be called by the names: x02anc, nag_machine_complex_safe or nag_complex_safe_small_number.

3 Description

X02ANC is a constant defined in the C Header file.
X02ANC is defined to be the smallest positive model number z such that for any x in the range [z,1/z] the following can be computed without undue loss of accuracy, overflow, underflow or other error: where w is any of x, ix, x+ix, 1/x, i/x, 1/x+i/x, and i is the square root of −1.

4 References


5 Arguments


6 Error Indicators and Warnings


7 Accuracy

Not applicable.

8 Parallelism and Performance

Background information to multithreading can be found in the Multithreading documentation.
X02ANC is not threaded in any implementation.

9 Further Comments


10 Example