Plotting a table of date+time pairs

Plotting a table of date+time pairs

[Michael Heerdegen]

Hi,

I want to plot two columns of an org table: the first column (the "x"
coordinate) consists of dates, the second column contains a time value
associated with each date.

It seems this is not as easy to do as I had hoped: AFAIU, for making
gnuplot interpret the "y"-value (!) as a time value I need to add
something like

  using "1:(timecolumn(2,\"%H:%M\"))"

to the gnuplot command line (it took me quite a while to find out how to
do it at all...)

And AFAIK this is only possible by tweaking
`org-plot/preset-plot-types'.  I need to add a complete new type of
plot!

Is there maybe a simpler way (I know I could add redundant columns to
the table to help org - that's not really what I want, though)?


TIA,

Michael.

Re: Plotting a table of date+time pairs

[Fraga, Eric]

Response below/inline for email Michael Heerdegen wrote:
> (original email sent 28 Nov 2024 at 02:21)
> 
> [...]
> And AFAIK this is only possible by tweaking
> `org-plot/preset-plot-types'.  I need to add a complete new type of
> plot!

You could use a gnuplot src block instead of org-plot?  It's what I do
usually as org-plot is not powerful enough for most of my plots
(although very nice for simple x-y graphs etc.).

-- 
: Eric S Fraga, with org 9.7.15-a1df10 in Emacs 31.0.50

Re: Plotting a table of date+time pairs

[Michael Heerdegen]

"Fraga, Eric" <e.fraga@ucl.ac.uk> writes:

> You could use a gnuplot src block instead of org-plot?  It's what I do
> usually as org-plot is not powerful enough for most of my plots
> (although very nice for simple x-y graphs etc.).

Ah ok, thank you.  Sounds reasonable.

I'm not a sophisticated org user.  May I ask for a simple example,
and how I would have to invoke gnuplot instead?


Thank you very much,

Michael.

Re: Plotting a table of date+time pairs

[Fraga, Eric]

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Response below/inline for email Michael Heerdegen wrote:
> (original email sent 29 Nov 2024 at 00:17)
> 
> I'm not a sophisticated org user.  May I ask for a simple example,
> and how I would have to invoke gnuplot instead?

Sure, see attached.  This example has a table of data to plot (simple
example with two columns) and the gnuplot src block to create a PDF
plot.  You invoke gnuplot by typing C-c C-c in the src block.  You can
then view the result with C-c C-o.

Check the info manual for org, specifically
(org) Working with Source Code

HTH,
eric
-- 
: Eric S Fraga, with org 9.7.15-a1df10 in Emacs 31.0.50

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Re: Plotting a table of date+time pairs

[Max Nikulin]

On 29/11/2024 06:17, Michael Heerdegen wrote:
> I'm not a sophisticated org user.  May I ask for a simple example,
> and how I would have to invoke gnuplot instead?

<https://orgmode.org/worg/org-contrib/babel/languages/ob-doc-gnuplot.html>

Link to its source is incorrect, it should be
<https://orgmode.org/worg/org-contrib/babel/languages/ob-doc-gnuplot.org>