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Re: expression formatting inside tables

  • To: mathgroup at
  • Subject: [mg54613] Re: [mg54591] expression formatting inside tables
  • From: "David Park" <djmp at>
  • Date: Thu, 24 Feb 2005 03:21:16 -0500 (EST)
  • Sender: owner-wri-mathgroup at


foo[x_] := x^2

Table[{HoldForm[foo[j]], foo[j]} /. j -> i, {i, 5}] // TableForm

If you look up the Table Help and then follow the link to Section A.4.2 on
evaluation of iteration functions you will see why this is necessary. Table
essentially creates a Block environment, sets i to an iterator value and
then evaluates the argument. But HoldForm[foo[i]] does not evaluate so it
does not get changed.

However, you can substitute into held expressions using Rules.

David Park
djmp at

From: Trevor Baca [mailto:trevorbaca at]
To: mathgroup at

hi mathgroup folks,


  foo[x_] := x^2

then how to easily tableize the following?

  foo[1]   1
  foo[2]   4
  foo[3]   9
  foo[4]   16
  foo[5]   25

because neither

  Table[{HoldForm[foo[i]], foo[i]}, {i, 5}] // TableForm


  Table[{foo[HoldForm[i]], foo[i]}, {i, 5}] // TableForm

did what i was expecting.


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