```Date: Feb 25, 2013 2:19 AM
Author: David Park
Subject: Re: Hold & Evaluate

Jakub,The following evaluates the denominator and then wraps it in a HoldForm.Table[n/HoldForm @@ {n + 0.1 (n + 1)}, {n, 1, 15}]% // ReleaseHold{1/1.2, 2/2.3, 3/3.4 ,4/4.5 ,5/5.6, 6/6.7, 7/7.8, 8/8.9, 9/10., 10/11.1,11/12.2, 12/13.3, 13/14.4,14/15.5, 15/16.6}{0.833333, 0.869565, 0.882353, 0.888889, 0.892857, 0.895522, \0.897436, 0.898876, 0.9, 0.900901, 0.901639, 0.902256, 0.902778, \0.903226, 0.903614}The following Presentations routine isolates Subexpressions by placing themwithin Tooltips that indicate they are held expressions and that also givesome control on whether there are parentheses and a key for selectiverelease. There are many cases, in physics say, where one might want to bindvarious constant expressions together and prevent them from being separatedduring simplification routines.<< Presentations`Table[n/CreateSubexpression[n + 0.1 (n + 1), False], {n, 1, 15}]% // ReleaseSubexpressions[]Which gives the same output as above except the denominators of thefractions have Tooltips of "held" on them.David Parkdjmpark@comcast.nethttp://home.comcast.net/~djmpark/index.htmlFrom: =A9er=FDch Jakub [mailto:Serych@panska.cz]Dear mathgroup,I would like to generate sequence in the form:1/1.2, 2/2.3, 3/3.4, 4/4.5, etc.It is very simple by a Table function:Table[n/(n + 0.1 (n + 1)), {n, 1, 15}]but as there are real numbers in denominators, Mathematica evaluates all and generates something like:{0.833333, 0.869565, 0.882353, 0.888889, 0.892857, 0.895522, etc.}How to evaluate numerators and denominators separately and print the sequence in that "fraction like" form?I tested:#[[1]]/#[[2]] & /@ Table[{n, n + 0.1 (n + 1)}, {n, 1, 15}] and than used Hold[] and Evaluate[]:Hold[Evaluate[#[[1]]]/Evaluate[#[[2]]]] & /@  Table[{n, n + 0.1 (n + 1)},{n, 1, 15}]But it doesn't work as the Hold has "veto" power over any evaluation.Thanks in advance for any idea, how to do itJakub
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