The ‘fear’ plot type might be something you can work with …

Try:
   ]a=:|: >1 2{"1 T
1 3 4
3 6 7
   'fbar' plot a

But you may need to adjust the 2nd row to be ‘duration’ (ie the difference), as 
in above first bar is 1-4 and you likely need to make this 1-3 being ordinal 
points:
   ]b=: (0&{  ,:  -/@:|.) a
1 3 4
2 3 3
   'fbar' plot b

This plots your Gant chart vertically, but I’m now sure how you can ’transpose’ 
the bars.

HTH Rob

> On 14 Nov 2021, at 9:07 am, Thomas Bulka <[email protected]> wrote:
> 
> Hi everyone,
> 
> say, I do have a CSV file which contains a table like the following:
> 
> T =: 3 3 $ 'Task 1';1;3;'Task 2';3;6;'Task 3';4;7
> 
> I wonder, whether it is possible to use the J plotting facilities to
> create something like a Gantt chart, in which I have three horizontal
> bars, such that > 1{"1 T gives the starting point of each bar and >
> 2{"1 T gives the end point.
> 
> Any help on where to start is very much appreciated!
> 
> Kind regards,
> 
> Thomas
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