quantity.to_string(precision=<int>) does not produce a string of the quantity with <int> decimals of precision #11131

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1. pllim

   added

   units

   Bug

   on Dec 4, 2020
2. pllim commented on Dec 4, 2020

   

   pllim

   on Dec 4, 2020

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   Seems like it only works if a Numpy array is given.

   >>> q = [10.12345] * u.m
   >>> print("%s"%q.to_string(precision=1))
   [10.1] m

   Behavior is the same as https://numpy.org/doc/stable/reference/generated/numpy.set_printoptions.html#numpy.set_printoptions . So even if this is a bug, maybe it is a upstream bug? @mhvk ?
3. ludwigschwardt commented on Dec 7, 2020

   

   ludwigschwardt

   on Dec 7, 2020

   Last edited by ludwigschwardt

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   I've noticed something similar but in the context of Angle... I've gone ahead and opened a separate issue in the end.
4. jmmaljaars commented on Dec 7, 2020

   

   jmmaljaars

   on Dec 7, 2020

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   The precision remained unused in case the format variable evaluated to the default value. #11145 should fix this. Please note, however, that the "general format" g is used rather than the "floating point format" f! So once #11145 is merged, the snippet

   from astropy import units as u
   q = 10.12345 * u.km
   print("%s"%q.to_string(precision=4))
   

   returns

   10.12 km
   

   🎉React with 🎉1Reacted by P. L. Lim
5. jmmaljaars

   added a commit that references this issue on Jan 6, 2021

   Fix Quantity.to_string() for non-latex format, fixes astropy#11131

   This issue will close once commit 179bf32 is merged into the 'master' branch.

   179bf32
6. mhvk

   closed this as completedin #11145on Jan 6, 2021
7. namurphy

   added 2 commits that reference this issue on Feb 21, 2021

   Fix Quantity.to_string() for non-latex format, fixes astropy#11131

   This issue will close once commit d395e3f is merged into the 'main' branch.

   d395e3f

   Fix Quantity.to_string() for non-latex format, fixes astropy#11131

   This issue will close once commit 4c23287 is merged into the 'main' branch.

   4c23287
8. nstarman

   added a commit that references this issue on Feb 28, 2021

   Fix Quantity.to_string() for non-latex format, fixes astropy#11131

   This issue will close once commit 45dd305 is merged into the 'main' branch.

   45dd305