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MathGroup Archive 2007

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Re: Fw: Re: Fw: 2

  • To: mathgroup at smc.vnet.net
  • Subject: [mg73725] Re: Fw: Re: Fw: 2
  • From: "dimitris" <dimmechan at yahoo.com>
  • Date: Mon, 26 Feb 2007 06:18:11 -0500 (EST)
  • References: <errl49$80t$1@smc.vnet.net>

One note about the example I used:

>The solutions should be
>Sqrt[Cos[Pi x]^2] Tan[Pi x] + 2 Floor[x + 1/2]

The function Floor[x + 1/2] has no meaning  for complex x!

So I should say for real x.

In[304]:=
(Sqrt[Cos[Pi*x]^2]*Tan[Pi*x] + 2*Floor[x + 1/2] /. x -> #1 & ) /@
Range[10]
Out[304]=
{2, 4, 6, 8, 10, 12, 14, 16, 18, 20}

See also here

http://groups.google.gr/group/comp.soft-sys.math.mathematica/browse_thread/=
thread/4910e88699673c27/b64afd02ba7186db?lnk=gst&q=Integrate&rnum=720=
&hl=el#b64afd02ba7186db


Regards
Dimitris


=CF/=C7 fizzy =DD=E3=F1=E1=F8=E5:
> Perhaps I should have added this.....I have upgraded to 5.2 and I realize
> that there are many additions that 4.2 doesnt have, etc.etc.etc.....that =
was
> hardly my point!!!!!.......part of what I was trying to say is that I sti=
ll
> use 4.2 just in case and have found it, at least for some of the things I=
've
> worked on, to be quite helpful to me in  a way that the upgrades were
> not........naturally, 4.2 doesnt work on every ocassion but I have found
> many instances where 4.2 will work although 5.2 wont or the answers are
> completely different......also, in terms of using , for example, a
> subscripted definition , such as
>
> E_subscript_x[x, y, z] , I have also found that 5.2 handles this quite
> differently then 4.2 especially if you take the derivative of the
> function.....(the subscript is gotten from the appropriate Palette).....in
> fact, I can't use this definition in 5.2....
>
> When I sent these comments, I thought that someone, at least at Wolfram,
> would care and would want to investigate this......if something doesnt wo=
rk
> in a New Version but does in an Old Version, strikes me as a Bug in the n=
ew
> software assuming that the earlier Version's answer was, in fact,
> correct....or, at least, it's food for thought...
>
> or I hope it is....Jerry
>
> ----- Original Message -----
> From: "dimitris" <dimmechan at yahoo.com>
> To: <mathgroup at smc.vnet.net>
> Sent: Saturday, February 24, 2007 1:11 AM
> Subject:  Re: Fw: 2
>
>
> > Try also the following links
> >
> > http://documents.wolfram.com/mathematica/Built-inFunctions/NewInVersion=
5=2E0/
> > http://www.wolfram.com/products/mathematica/newin51/
> > http://www.google.com/search?hl=en&q=mathematica+version+5.2
> >
> > May be this material will convince for upgrading!
> >
> > Regards
> > Dimitris
> >
> > =CF/=C7 fizzy =DD=E3=F1=E1=F8=E5:
> >> This is an interesting question for me for another reason.....my
> >> 'favorit=
> > e'
> >> version of Mathematica is still 4.2....I have found many things that
> >> work=
> > in
> >> 4.2 but do not work in 5.2....I have always been meaning to send them =
to
> >> mathgroup but, must admit, I'm too lazy for it.....however, this examp=
le
> >> here is perfect for the ocassion....
> >>
> >> It works in 4.2......interesting also, that the Output in 5.2 for  the
> >> Series[ ] question, the answer seems different....I havent investigated
> >> it
> >> further, just want to point out the interesting differences.....
> >>
> >> Jerry Blimbaum
> >>
> >> ----- Original Message -----
> >> From: "Andrzej Kozlowski" <akoz at mimuw.edu.pl>
> >> To: <mathgroup at smc.vnet.net>
> >> Sent: Thursday, February 22, 2007 3:35 AM
> >> Subject:
> >>
> >>
> >> > Try:
> >> >
> >> > Series[ArcCosh[x], {x, 0, 11}]
> >> >
> >> > and now try
> >> >
> >> > ArcCosh[x] + O[x]^12
> >> >
> >> > At least with my version of Mathematica:
> >> >
> >> > $Version
> >> > 5.2 for Mac OS X (February 24, 2006)
> >> >
> >> >
> >> > I do not get the same answer (in fact in the latter case the input is
> >> > returned unevaluated). With ArcSinh and any other function that I
> >> > have tried in place of ArcCosh  the outputs are always the same.
> >> >
> >> > Andrzej Kozlowski
> >> >
> >> >
> >> >
> >> >
> >> >
> >> >
> >
> >
> >
> >



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