### astAxNorm

Normalise an array of axis values

#### Description:

This function modifies a supplied array of axis values so that they are normalised in the manner indicated by parameter " oper" .

No normalisation is possible for a simple Frame and so the supplied values are returned unchanged. However, this may not be the case for specialised sub-classes of Frame. For instance, a SkyFrame has a discontinuity at zero longitude and so a longitude value can be expressed in the range [-Pi,$+$PI] or the range [0,2$\ast$PI]. See the " Applicability:" section below for details.

#### Synopsis

void astAxNorm( AstFrame $\ast$this, int axis, int oper, int nval, double $\ast$values, int $\ast$status )

#### Parameters:

##### this
Pointer to the Frame.
##### axis
The index of the axis to which the supplied values refer. The first axis has index 1.
##### oper
Indicates the type of normalisation to be applied. If zero is supplied, the normalisation will be the same as that performed by function astNorm. If 1 is supplied, the normalisation will be chosen automatically so that the resulting list has the smallest range.
##### nval
The number of points in the values array.
##### values
On entry, the axis values to be normalised. Modified on exit to hold the normalised values.

#### Applicability

##### SkyFrame
If " oper" is 0, longitude values are returned in the range [0,2$\ast$PI]. If " oper" is 1, longitude values are returned in either the range [0,2$\ast$PI] or [-PI,PI]. The choice is made so that that the resulting list has the smallest range. Latitude values are always returned in the range [-PI,PI].
##### All other classes of Frame
The supplied axis values are returned unchanged.