I haven't found a solution that works perfectly yet but I circumvented the
problem by making a check for colons:
rows = inds[1] == Colon() ? (1:sys.ny) : inds[1]
cols = inds[2] == Colon() ? (1:sys.nu) : inds[2]
Not perfect since it limits you to always have to use exactly 2 incidences,
but it works in my case.
Maybe the handling of Array{Vector} should be looked at, seems to me that
there are quiet a few cases where you run into problems with that datatype.
For example, I don't think there is a built in way to transpose an
Array{Vector, N>1}.
