# NAG CL Interfacex07bac (create_​infinity)

## 1Purpose

x07bac creates a signed infinite value.

## 2Specification

 #include
 void x07bac (Integer isign, double *x)
The function may be called by the names: x07bac, nag_ieee_create_infinity or nag_create_infinity.

## 3Description

x07bac sets x to be positive or negative infinity.

## 4References

IEEE (2008) Standard for Floating-Point Arithmetic IEEE Standard 754-2008 IEEE, New York.

## 5Arguments

1: $\mathbf{isign}$Integer Input
On entry: determines the sign of the infinity to be created.
If isign is greater than or equal to $0$, a positive infinity is returned, otherwise a negative infinity is returned.
2: $\mathbf{x}$double * Output
On exit: the required infinite value.

None.

Not applicable.

## 8Parallelism and Performance

x07bac is not threaded in any implementation.