NAG Library Routine Document

x02alf (real_largest)

1
Purpose

x02alf returns the largest positive floating-point number.

2
Specification

Fortran Interface
Function x02alf ( )
Real (Kind=nag_wp):: x02alf
C Header Interface
#include <nagmk26.h>
double  x02alf_ ()

3
Description

x02alf returns the largest positive number in the model of floating-point arithmetic described in the X02 Chapter Introduction. The returned value is equal to 1- b-p × bemax , where b is the arithmetic base (see x02bhf) and emax  is the maximum exponent (see x02blf) in the model.

4
References

None.

5
Arguments

None.

6
Error Indicators and Warnings

None.

7
Accuracy

None.

8
Parallelism and Performance

x02alf is not threaded in any implementation.

9
Further Comments

None.

10
Example

See Section 10 in x02ajf.