[MINC-users] mincreshape sets start/step on vector_dimension

[Alex Zijdenbos]

Hi all,

Using mincreshape to manipulate the spatial dimensions of a deformation
field, I notice two things (example below):

1) It complains about 'vector_dimension' being a non-standard dimension.
Given the ubiquitous minctracc-generated deformation fields, shouldn't
'vector_dimension' be a 'standard' dimension by now?

2) it arbitrarily sets start=0 and step=1 for that dimension. If a
dimension is untouched and doesn't/shouldn't have start or step values to
begin with, I'd say that mincreshape shouldn't 'invent' a start and step
for it, but leave these undefined.

Thoughts?

-- A


$ mincreshape -dimorder zspace,yspace,xspace in_grid_0.mnc out_grid_0.mnc
(from micreate_std_variable): Variable 'vector_dimension' is not a standard
MINC variable
Copying
chunks:...............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................Done.
$ mincinfo in_grid_0.mnc out_grid_0.mnc
file: in_grid_0.mnc
image: signed__ float -11.107932090759277344 to 11.2635040283203125
image dimensions: vector_dimension zspace yspace xspace
    dimension name         length         step        start
    --------------         ------         ----        -----
    vector_dimension            3      unknown      unknown
    zspace                    181            1          -72
    yspace                    217            1         -126
    xspace                    181            1          -90


file: out_grid_0.mnc
image: signed__ float -11.107932090759277344 to 11.2635040283203125
image dimensions: vector_dimension zspace yspace xspace
    dimension name         length         step        start
    --------------         ------         ----        -----
    vector_dimension            3            1            0
    zspace                    181            1          -72
    yspace                    217            1         -126
    xspace                    181            1          -90