CODEWITHSUNDEEP
datetimeplotgnuplot
Foo Bar
Foo Bar

Reputation: 1892

How to format tic labels in Gnuplot with custom date/time strings?

Is there any possibility in gnuplot to format time-based tic labels with custom functions? I know that I can use the regular format codes like

set format x '%Y-%m-%d, %a'

In this example the %a would print English short names of the weekday. So I wrote a mapping function that could translate the name to German:

dow(d) =  \
  (d == 0) ? 'So' : \
  (d == 1) ? 'Mo' : \
  (d == 2) ? 'Di' : \
  (d == 3) ? 'Mi' : \
  (d == 4) ? 'Do' : \
  (d == 5) ? 'Fr' : \
  'Sa'

But how can I call this function? The correct format string would be %w, but this:

set format x '%Y-%m-%d, ' . dow('%w')

does not work, because it tries to actually pass the string "%w" to my function. I also know that there's tm_wday(t) (where the argument t would be an Unix timestamp) which returns the 0-based number of the weekday (which my mapping function needs). But how would I tell set format x to take the current tic value (which actually is internally an Unix timestamp when setting set xdata time) as an argument to this function?

I'm using the latest gnuplot trunk version, if this is of any relevance (so I can use any feature that currently exists, even if still undocumented).

Upvotes: 1

Views: 337

Answers (1)

Christoph
Christoph

Reputation: 48390

The locale settings determine how numbers and dates in tic labels are formatted, e.g.

set locale 'de_DE.utf8'

or

set locale 'German_Germany.1252'

depending on your system.

Upvotes: 2

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