CTAN update: siunitx - ctan-ann

18 May 2021


      Joseph Wright submitted an update to the
siunitx
package.
Version:  3.0.0 2021-05-17
License:  lppl1.3c
Summary description:  A comprehensive (SI) units package
Announcement text:
----------------------------------------------------------------------
Version 3 is a major update to `siunitx`, which has largely been
 re-written internally. A significant number of key-value
 settings have new, more descriptive, names. Where possible,
 older names are mapped to newer ones internally: you will be
 warned in the log if this is the case.
It is possible to use the LaTeX kernel mechanism to load the
 last version 2 release for documents that cannot be successfully
 processed using version 3. This can be achieved using
 ```
 usepackage{siunitx}[=2021-04-09]
 or
 ```latex
 usepackage{siunitx}[=v2]
 ```
In version 3, the document commands have been revised to be more
 descriptive. As such, the commands `SI`,`SIlist`, `SIrange`
 and `si` remain available but are not recommended for use in
 new use.
Some changes have been made to the semantics of commands or
 options. Most notably
 - prefixes cannot now be given without units;
 - prefixes can only be interconverted with numbers as part of a
   quantity, not as stand-alone units.
The font control system has been completely re-written for
 version 3. The method used in entirely different from version 2.
 Emulation is therefore not provided for some aspects: if you
 need non-standard font settings, you will need to adjust your
 source.
The input approach for version 3 is slightly more structured and
 restricted than for version 2. As well as the updated names for
 document commands, this means that
 - Products of numbers must now be given using the dedicated
   `
umproduct` and `qtyproduct` commands;
 - Quotients of numbers are only supported as literals;
 - Complex values need to be given using the dedicated command
   `complexnum`
The letter used for a numerical tabular column can now be
 selected by the user: the letter `S` has been retained as the
 standard interface. The unit column (`s`) has been removed from
 this release. It can be emulated using the `collcell` package,
 for example
 ```latex
 usepackage{collcell}
ewcolumntype{s}{>{collectcellunit}c<{endcollectcell}}
 ```
 or
 ```latex
 usepackage{collcell}
ewcolumntype{s}{>{collectcellsi}c<{endcollectcell}}
 ```
A new approach has been taken to providing non-Latin symbols for
 use in units: these are now handled directly where needed, for
 example in the definition of the `micro` prefix.
If you are using `table-column-width` to have fixed-width
 columns, you also now need `table-fixed-width` to set this
 option active.
----------------------------------------------------------------------
The package’s Catalogue entry can be viewed at
   https://ctan.org/pkg/siunitx
The package’s files themselves can be inspected at
   https://mirrors.ctan.org/macros/latex/contrib/siunitx/
------------------------------------------------------------------------
Thanks for the upload.
For the CTAN Team
    Petra Rübe-Pugliese
------------------------------------------------------------------------
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