Various questions

[Wichaya Changwatchai]

Several questions:

1) The section on range constants says that:

        Octave does not convert range constants to vectors unless it is
        necessary to do so.

When would it NOT be necessary to convert a range constant to a vector?  Would
an example be, say, a for loop?

2) Is there a way to subscript a constant range, e.g.

        [2:2:10](2:4)

as opposed to having to assign it to a dummy variable:

        a = [2:2:10];
        a(2:4)

3) The operators .+ and .- don't seem to work, as documented in the manual (of
course, they ARE redundant with + and -).  Have they been disabled?

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