Hi Rosario,
I can't say for sure without seeing the data, but I'm guessing that
your "utc" column is a string value using ISO-8601-like formatting
(like "2023-11-17T12:53:46"). Since it's a string value, topcat
doesn't offer it for selection as something that can be plotted,
but you can convert it into a number using the functions documented at
http://www.starlink.ac.uk/topcat/sun253/Times.html
For instance the expression "isoToMjd(utc)" will convert it to a
Modified Julian Date, or "mjdToDecYear(isoToMjd(utc))" will
convert it to decimal year.
You can either just type that conversion expression into the plot
window column selector, or you can add a new numeric column to the
table using the "New Synthetic Column" button in the Columns Window:
http://www.starlink.ac.uk/topcat/sun253/ColumnInfoWindow.html
then you will be able to select it from the column selector.
At present the cube plot will is not able to label time axes using
ISO-8601-like formatting, only the (2d) Time Plot does that:
http://www.starlink.ac.uk/topcat/sun253/TimePlotWindow.html
So you'll have to live with numeric axis labelling like MJD or years.
If you still can't get it working feel free to get back to me
on- or off-list.
Mark
On Fri, 17 Nov 2023, Rosario Lorente wrote:
>
> Hello,
>
>
>
> I would like to plot a cube where one of the axes is time (in UTC would be
> great).
>
> My table has the time column (see table.png) but it does not appear as an
> option in the “Position” tab (see position.png), to be chosen as one of the
> axes. I wonder if it is a format problem, or it is because it is not
> possible at all.
>
>
>
> Many thanks for your help!
>
> Regards,
>
> Charo
>
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--
Mark Taylor Astronomical Programmer Physics, Bristol University, UK
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