Label(axis) - Axis label

Description:

This attribute specifies a label to be attached to each axis of a Frame when it is represented (e.g.) in graphical output.

If a Label value has not been set for a Frame axis, then a suitable default is supplied, depending on whether or not the Frame is a SkyFrame.

The default for simple Frames is the string "Axis <n>", where <${\tt {n}}$> is 1, 2, etc. for each successive axis.

The default labels for specialised Frames (SkyFrames, SpecFrames, etc.) depend on the particular co-ordinate system represented by the Frame (e.g. "Right ascension", "Galactic latitude", "Frequency", "Wavelength in air", etc.).

Type:

String.

Examples:

wcsattrib my_data set label(2) "IRAS data (marked in white)"

This sets the Label for axis 2 in the current Frame in the NDF called my_data, to the string "IRAS data (marked in white)".

Notes:

• Axis labels are intended purely for interpretation by human readers and not by software.

• When specifying this attribute by name, it should be subscripted with the number of the Frame axis to which it applies.