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MathGroup Archive 2006

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Re: GridBox coming back unevaluated

  • To: mathgroup at smc.vnet.net
  • Subject: [mg65572] Re: GridBox coming back unevaluated
  • From: bghiggins at ucdavis.edu
  • Date: Sat, 8 Apr 2006 00:45:15 -0400 (EDT)
  • References: <e15eha$2r1$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

What you need to do is wrap Range with ToExpression as follows:


DisplayForm[GridBox[Partition[ToExpression[Range[9]],3],
RowLines->True, ColumnLines->True]]

Apparently, the output from Range in the form of boxes is not being
interpreted. The function ToExpressions forces the boxes to be
interpreted as a Mathematica expression.

Cheers,

Brian


J Siehler wrote:
> Hello, group,
>
> I'm perplexed by the results of the following
>
> GridBox[Table[3i + j, {i, 0, 2}, {j, 1, 3}], RowLines -> True,
> ColumnLines -> True] //DisplayForm
>
> GridBox[Partition[Range[9], 3], RowLines -> True, ColumnLines ->True]
> // DisplayForm
>
> The first returns a nicely formatted box; the second does not.  Tracing
> the execution of the two shows that they both arrive, of course, at
>
> GridBox[{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}, RowLines -> True,
> ColumnLines -> True]
>
> but only the first proceeds from that point to returning
> two-dimensional output.
>
> Here is a minor variation:
>
> m = {{1, 2}, {3, 4}}
> ma = Append[m, {5, 6}]
> mb = Append[m, Range[5, 6]]
> ma === mb
>
> GridBox[ma] // DisplayForm
> GridBox[mb] // DisplayForm
>
> The penultimate line returns a 2D box; the last line does not.  Anyone
> care to enlighten me?


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