Groups > comp.graphics.apps.gnuplot > #987

Re: data cutoff threshold for `plot`

Path	csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!news.glorb.com!postnews.google.com!l14g2000vbe.googlegroups.com!not-for-mail
From	ab <ab.3942@googlemail.com>
Newsgroups	comp.graphics.apps.gnuplot
Subject	Re: data cutoff threshold for `plot`
Date	Mon, 19 Mar 2012 00:26:02 -0700 (PDT)
Organization	http://groups.google.com
Lines	32
Message-ID	<f588dd23-ba05-4efc-8603-83bdafbb4e0d@l14g2000vbe.googlegroups.com> (permalink)
References	<13798827.2811.1332009596089.JavaMail.geo-discussion-forums@vbze11>
NNTP-Posting-Host	194.99.122.193
Mime-Version	1.0
Content-Type	text/plain; charset=ISO-8859-1
Content-Transfer-Encoding	quoted-printable
X-Trace	posting.google.com 1332141962 2795 127.0.0.1 (19 Mar 2012 07:26:02 GMT)
X-Complaints-To	groups-abuse@google.com
NNTP-Posting-Date	Mon, 19 Mar 2012 07:26:02 +0000 (UTC)
Complaints-To	groups-abuse@google.com
Injection-Info	l14g2000vbe.googlegroups.com; posting-host=194.99.122.193; posting-account=aUX_SgoAAAANFc1Z3AbGx-co6QimaYdU
User-Agent	G2/1.0
X-HTTP-UserAgent	Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.2; WOW64; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; InfoPath.2; .NET CLR 3.0.04506.30; .NET CLR 3.0.04506.648; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729),gzip(gfe)
Xref	csiph.com comp.graphics.apps.gnuplot:987

Show key headers only | View raw

On 17 Mrz., 19:39, bryan <bryanlep...@gmail.com> wrote:
> [ gnuplot 4.6 ]
> Is there something like a threshold that applies to a single plot type after `plot` is given? If this can be done using two y-axes, there's already a lot in the newsgroup for that I can try.
>
> I have some x/y data. I'd like to combine impulses with a line, however, I'd like to plot the line for data below some threshold. e.g. impulses for all data, but a line to connect tops of the impulses for data points below some value e.g. 5000 (see below)
>
> imaginary pseudo-code to illustrate what I'd like to do:
>
> yrange [0:10000]
> plot \
> 'data.dat' u 1:2 w i, \
> ''         u 1:2 w l threshold=5000
>
> ... so the plot will have impulses above 5000 that stand alone and are not connected to those below 5000. the ones below will appear connected.
>
> -Bryan

Hi,
try to use the ternary operator

f_below(x) = x<5000?     x  : NaN      # Will skip everything above
5000
f_above(x) = x<5000? NaN : x

now you can plot f_below and f_above individually using lines, impules
or whatever.

Back to comp.graphics.apps.gnuplot | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

data cutoff threshold for `plot` bryan <bryanlepore@gmail.com> - 2012-03-17 11:39 -0700
  Re: data cutoff threshold for `plot` ab <ab.3942@googlemail.com> - 2012-03-19 00:26 -0700
    Re: data cutoff threshold for `plot` bryan <bryanlepore@gmail.com> - 2012-03-19 08:25 -0700

csiph-web