From: Michael Brand <michael.ch.brand@gmail.com>
To: Benjamin Beckwith <bnbeckwith@gmail.com>
Cc: nicholas.dokos@hp.com, Org Mode <emacs-orgmode@gnu.org>
Subject: Re: Field coordinates and moving averages
Date: Tue, 15 Nov 2011 20:16:33 +0100 [thread overview]
Message-ID: <CALn3zojb0039=s490Dt_bEhpSdi=x7v_BUeXx+ppujx-vRGoJg@mail.gmail.com> (raw)
In-Reply-To: <26090.1321372379@alphaville.dokosmarshall.org>
Hi Ben
On Tue, Nov 15, 2011 at 16:21, Benjamin Beckwith <bnbeckwith@gmail.com> wrote:
> #+TBLFM: $2=if(@# >=7, vmean(@-5$1..@0$1),string(""));
The above does not work because the range expression "@-5$1..@0$1" is
an Org construct and has to be evaluated for every affected row
already in Org, before it is given to Calc. It has therefore no other
choice than failing together with "$2 =" (out of range), the
expression "@# >= 7" is evaluated only in Calc later. This is one of
the reasons for which I added "field coordinates in formulas" (@# and
$#) in 2010-03.
There are at least two solutions with a Calc formula for this use
case:
1) range formula
The clean solution, already given by Nick:
On Tue, Nov 15, 2011 at 16:52, Nick Dokos <nicholas.dokos@hp.com> wrote:
> Try a range on the LHS:
> #+TBLFM: @7$2..@>$2=vmean(@-5$1..@0$1)
2) Calc subvec with field coordinates in formulas
This was the only solution before Carsten introduced range formulas in
2011-03 and might be interesting for understanding purposes:
| Daily Data | Moving Average |
|------------+----------------|
| 10 | |
| 11 | |
| 12 | |
| 13 | |
| 14 | |
| 14 | 12.333 |
| 16 | 13.333 |
#+TBLFM: $2 = if(@# >= 7, vmean(subvec(@I$1..@>$1, @# - 6, @#)) +.0,
string("")); f-3
See also "Dynamic variation of ranges" in "field coordinates in
formulas (@# and $#)" here:
http://orgmode.org/worg/org-hacks.html
reachable about one or two pages down with the current section
numbering here:
http://orgmode.org/worg/org-hacks.html#sec-1-3-5
For such a two-dimensional moving range, Calc subsrc/subvec is still
the simpler solution to get the triangle than several range formulas
would be.
If you change the input field 16 to 20 you see that "+.0" is required
in the formula to get 14.000 instead of 14 for the result. See "Which
float format shows the fraction part also when the latter is zero?"
here:
http://orgmode.org/worg/org-faq.html#table-float-fraction
Michael
prev parent reply other threads:[~2011-11-15 19:17 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-15 15:21 Field coordinates and moving averages Benjamin Beckwith
2011-11-15 15:52 ` Nick Dokos
2011-11-15 19:16 ` Michael Brand [this message]
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