'write_which' of interfaces.spm.preprocess.RealignInputSpec gives matlab issues

[beOn]

'write_which' is currently defined as follows:

write_which = traits.Tuple(traits.Int, traits.Int, field='roptions.which',
                              desc='determines which images to reslice')

This generates the following in pyscript_realign.m:

jobs{1}.spatial{1}.realign{1}.estwrite.roptions.which = (0, 1);

That is not valid matlab syntax - it causes the following type of error:

Error: Expression or statement is incorrect--possibly unbalanced (, {, or [.

I launched matlab and built a job by hand. 'which' is supposed to be a two item vecor, like so:

>> matlabbatch{1}.spm.spatial.realign.estwrite.roptions
ans =
    which: [0 1]
    interp: 4
    wrap: [0 0 0]
    mask: 1
    prefix: 'r'

If I redefine write_which like so:

write_which = traits.List(traits.Int, traits.Int, field='roptions.which',
                              desc='determines which images to reslice')

... it generates the following matlab script:

jobs{1}.spatial{1}.realign{1}.estwrite.roptions.which(1) = 0;
jobs{1}.spatial{1}.realign{1}.estwrite.roptions.which(2) = 1;

... which works.

I will submit a pull request for this shortly.