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The following,

table = 
  TableForm[ConstantArray[0, {3, 3}], 
   TableAlignments -> Right, 
   TableHeadings -> {None, {"One", "Two", "Three"}}]

generates a table with headings:

enter image description here

I see that its FullForm is

    List[HoldForm[\[Placeholder]], HoldForm[\[Placeholder]], HoldForm[\[Placeholder]]],
    List[HoldForm[\[Placeholder]], HoldForm[\[Placeholder]], HoldForm[\[Placeholder]]],
    List[HoldForm[\[Placeholder]], HoldForm[\[Placeholder]], HoldForm[\[Placeholder]]]],
    Rule[TableAlignments, Right],
    Rule[TableHeadings, List[None, List["One", "Two", "Three"]]

and I could parse this to retrieve the value of TableHeadings.

But is there a more canonical approach?

I found that for plots, one can use Options[plot], but I couldn't find a counterpart for tables.

share|improve this question
up vote 4 down vote accepted

Options seems to work just fine:

Options[table, TableHeadings]

(* {TableHeadings -> {None, {"One", "Two", "Three"}}} *)

... slightly generalized:

getopt[obj_, opt_] := opt /. Options[obj, opt]

getopt[table, TableHeadings]

(* {None, {"One", "Two", "Three"}} *)

share|improve this answer
D'oh! I tried that but my test case was flawed—the options were stripped while copy-pasting a table in TableForm for use in InputForm. Thank you. – Andrew Cheong Feb 27 '14 at 10:06
Hehe - happy to help :D – Yves Klett Feb 27 '14 at 10:06
Cases[InputForm[yourTableFormRefHere], HoldPattern[TableHeadings -> a_] :> a, Infinity]

Should do the trick.

share|improve this answer
Works, thanks! I realized though that Options does work and I was simply misusing it. – Andrew Cheong Feb 27 '14 at 10:06
@acheong87 - lol, I assumed based on the quality of your questions that it didn't, so didn't bother to check. We both get 1 DOH! point... – ciao Feb 27 '14 at 10:25
IMO, a completely reasonable assumption given the context, haha. – Andrew Cheong Feb 27 '14 at 10:26

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