
Re: Hold & Evaluate
Posted:
Feb 25, 2013 2:18 AM


On Feb 23, 8:31 pm, =A9er=FDch Jakub <Ser...@panska.cz> wrote: > 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 it > > Jakub
Table[SequenceForm[n, "/", n + .1(n+1)], {n,15}]
{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}

