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Re: Extract Integers
*To*: mathgroup at smc.vnet.net
*Subject*: [mg131428] Re: Extract Integers
*From*: Ray Koopman <koopman at sfu.ca>
*Date*: Sun, 21 Jul 2013 21:41:57 -0400 (EDT)
*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com
*Delivered-to*: l-mathgroup@wolfram.com
*Delivered-to*: mathgroup-outx@smc.vnet.net
*Delivered-to*: mathgroup-newsendx@smc.vnet.net
Third try.
Cases[ Replace[equ, _[c__]:>{c}, {0,Infinity}], _Integer, -1]
{1, 1, 2, 2, 1, 6, 3, 1, 24, 4, 1, 120, 5}
----- Dana DeLouis <dana01 at icloud.com> wrote:
> Hi. I've run out of ideas. Does anyone know the proper way to
> extract all the integers from the following simplified version
> of a larger problem I'm working on?
>
> equ=Series[Exp[x],{x,0,5}] //Normal
>
> 1+x+x^2/2+x^3/6+x^4/24+x^5/120
>
> When trying to extract all the integers,
> I understand numbers like 120 are part of Rational[1,120]
>
> equ //FullForm
>
> << Not shown here >>
>
> I thought looking at all LevelSpec was the solution, but apparently not.
>
> Cases[equ, _Integer, Infinity]
> {1,2,3,4,5}
>
> (* Or *)
>
> Position[equ, _Integer, Infinity]
> {{1},{3,2,2},{4,2,2},{5,2,2},{6,2,2}}
>
> Extract[equ, %]
> {1,2,3,4,5}
>
> Both ways extract from the numerator, but I just can't seem to extract
> the {2,6,24,120} inside the denominator.
> Does anyone know the proper way?
> Thanks in advance. :>~
>
> Dana
> Mac & Math 9
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