AIPS HELP file for TRANS in 31DEC22
As of Wed Dec 8 8:57:22 2021
TRANS: Task to transpose a subimage of an up to 7-dim. image
INNAME Input name(name).
INCLASS Input name(class).
INSEQ 0.0 9999.0 Input name(seq. #). 0=>high
INDISK Input disk drive #. 0=>any
OUTNAME Output name(name).
OUTCLASS Output name(class).
OUTSEQ -1.0 9999.0 Output name(seq. #).
0 => highest unique
OUTDISK Output image disk drive #
0 => highest with room
BLC 0.0 4096.0 Bottom left corner of image
0 => entire image
TRC 0.0 4096.0 Top right corner of image
0 => entire image
TRANSCOD New axis order in terms of
input axis numbers
BADDISK Disks to avoid for scratch
Use: TRANS will perform arbitrary matrix transpositions on
images of up to 7 dimensions. It will also reverse
the order of pixels on any specified axes and will
carry out these operations on a subarray of the input
image if so instructed.
INNAME......Input name of image(name). Standard defaults.
INCLASS.....Input name of image(class). Standard defaults.
INSEQ.......Input name of image(seq. #). 0 => highest.
INDISK......Disk drive # of image. 0 => any.
OUTNAME.....Output name of image(name). Standard defaults.
OUTCLASS....Output name of image(class). Standard defaults.
OUTSEQ......Output name of image(seq. #). 0 => highest unique.
OUTDISK.....Disk drive # of Output image. 0 => highest
BLC.........The bottom left-hand pixel of the input image
to be included. 0 => 1.
TRC.........The top right-hand pixel of the input image
to be included. 0 => high pixel # on that axis
TRANSCOD....The new axis order in terms of the old axis order
numbers: i.e. '312' means make input axis 3 the
first output axis, input axis 1 the second output
axis, etc. Use a - to reverse the pixel order on
an axis, e.g. '3-12', '-312', '-31-2' etc.
TRANSCOD may contain blank and comma separators as well
as the minus sign and numbers 1 through 7 only. All
input axes having more than 1 pixel must be included in
TRANSCOD and may be included only once.
BADDISK.....Disk(s) to avoid in creating scratch files.
TRANS: Task which interchanges and/or reverses axes in a cube.
DOCUMENTOR: J.H.van Gorkom NRAO/VLA
RELATED PROGRAMS: MCUBE, MOMNT, SLICE, PROFL
TRANS changes the order of the axes in a cube and can also
reverse the pixel order of an axis. For example, if one has a
cube of (RA,DEC) maps with frequency on the third axis, one can
transpose it into a set of (RA,FREQ) maps with declination on
the third axis. This then makes it possible to do profile
analysis on the maps with MOMNT, to plot single profiles with
SLICE and SL2PL/LWPLA, or to plot a set of profiles with PROFL.
The pixel order of an axis can be reversed. This is useful
for example if one has made a cube with increasing frequency on
one axis; by reversing the pixel order one gets the data in
order of increasing velocity. TRANS can be used on two
dimensional images in order to transpose the image.
TRANS works faster on data in integer (I*2) format, and
most software likely to be used after TRANS requires this
format. MCUBE creates cubes in real (R*4) format however. It is
therefore worth using CNVRT to convert cube data from real
format to integer format before running TRANS. (See also the
EXPLAIN file for CNVRT).