routine sets a new value for a LABEL component of an existing NDF AXIS
data structure. The NDF
is accessed in update mode and any pre-existing LABEL component is over-written with a new value.
Alternatively, if a ‘null’ value (
) is given for the LABEL parameter, then the NDF’s axis LABEL
component will be erased. If an AXIS structure does not exist, a new one whose centres are pixel
co-ordinates is created.
axlabel ndf label dim
DIM = _INTEGER
The axis dimension for which the label is to be modified. There are separate labels
for each NDF dimension. The value must lie between 1 and the number of dimensions
of the NDF. This defaults to 1 for a one-dimensional NDF. The suggested default is the
NDF = NDF (Read and Write)
The NDF data structure in which an
axis LABEL component is to be modified.
LABEL = LITERAL (Read)
The value to be
assigned to the NDF’s axis LABEL component (e.g.
"Fibre index"). LABEL
describes the quantity measured along the axis. This value may later be used by other
applications for labelling graphs or as a heading for columns in tabulated output. The
suggested default is the current value.
axlabel ngc253 "Offset from nucleus" 2
Sets the LABEL component of the second axis dimension of the NDF structure ngc253 to
have the value
"Offset from nucleus".
axlabel ndf=spect label=Wavelength Sets the
axis LABEL component of the one-dimensional NDF structure spect to have the value
axlabel datafile label=! dim=3 By specifying a null value (
!), this example
erases any previous value of the LABEL component for the third dimension in the NDF