Talk:Quadruple-precision floating-point format: Difference between revisions

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:::Now I think that there should be a third subsection "Libraries and toolboxes" for [[Quadruple-precision floating-point format#Implementations|Implementations]], and these external links would mainly be references (unless there already is a Wikipedia article for them). – [[User:Vincent Lefèvre|Vincent Lefèvre]] ([[User talk:Vincent Lefèvre|talk]]) 11:05, 20 June 2015 (UTC)

::::I think this would work nicely. Actually, as a draft, I have added such sub-section with two references. Please revise/remove it or let's discuss further. I have added link to toolbox if no other complains exist. <small><span class="autosigned">—&nbsp;Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[User:Kletka|Kletka]] ([[User talk:Kletka|talk]] • [[Special:Contributions/Kletka|contribs]]) 0102:5935, 22 June 2015 (UTC)</span></small><!-- Template:Unsigned --> <!--Autosigned by SineBot-->

:::::They were not references, but external links. I've replaced them by references, with more accurate URL's about the features in question. – [[User:Vincent Lefèvre|Vincent Lefèvre]] ([[User talk:Vincent Lefèvre|talk]]) 22:12, 22 June 2015 (UTC)

::::::Yes, definitely, this is much better. Will follow the style in future. [[Special:Contributions/223.218.164.210|223.218.164.210]] ([[User talk:223.218.164.210|talk]]) 02:24, 23 June 2015 (UTC)

== External links modified ==

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== Add minimum to examples? ==

<pre>

0001 0000 0000 0000 0000 0000 0000 0000 ≈ -1.189731495357231765085759326628008 × 10^-4932

(min quadruple precision)

</pre>

This probably needs to be added for those wishing to know what the minimum is in hexadecimal. However, I am not sure if it is truely `-1.189...7 + 0.0...1 x 10<sup>-4932</sup>`. I didn't calculate it.

Much love, [[User:PauSix|PauSix]] ([[User talk:PauSix|talk]]) 03:27, 20 October 2018 (UTC)

:Last November I added more examples to all the various floating-point formats, so that (hopefully) they all contain the same set of examples. The minimum value mentioned above was added as "smallest positive normal number". [[User:Pjacklam|Peter J. Acklam]] ([[User talk:Pjacklam|talk]]) 07:44, 7 August 2019 (UTC)

== Conversion to binary and back ==

The sentence "If a decimal string with at most 33 significant digits is converted to IEEE 754 quadruple-precision representation, and then converted back to a decimal string with the same number of digits, the final result should match the original string" is only true if the quadruple precision representation is a normal number. Subnormals have less precision and proportionately fewer decimal digits are allowed. The wikipedia article for double precision floating-point format has the same issue. [[Special:Contributions/2601:18C:4200:60F0:845C:148F:C31C:6449|2601:18C:4200:60F0:845C:148F:C31C:6449]] ([[User talk:2601:18C:4200:60F0:845C:148F:C31C:6449|talk]]) 13:48, 15 August 2022 (UTC)

:Thanks (and this won't work either in case of overflow, though this is a bit more obvious). I've just done the correction in [[Quadruple-precision floating-point format]], [[Double-precision floating-point format]] and [[Single-precision floating-point format]]. — [[User:Vincent Lefèvre|Vincent Lefèvre]] ([[User talk:Vincent Lefèvre|talk]]) 17:43, 17 August 2022 (UTC)

== Broken Link ==

Reference 1, which is:

David H. Bailey; Jonathan M. Borwein (July 6, 2009). "High-Precision Computation and Mathematical Physics" (PDF).

no longer works for me. [[Special:Contributions/64.16.131.2|64.16.131.2]] ([[User talk:64.16.131.2|talk]]) 21:45, 22 February 2023 (UTC)

:Thanks for the information. I've just updated the URL. — [[User:Vincent Lefèvre|Vincent Lefèvre]] ([[User talk:Vincent Lefèvre|talk]]) 21:58, 22 February 2023 (UTC)

== request about discussion / seek consensus for the info about different understanding of the encodings ==

I added an info about 'integral understanding of the significand', fully backed by IEEE standard paper and with citation, the user Vincent Lefèvre like to delete it repeatedly. IMHO it's against WP policy about different opinions, he should seek consenus here!

== request to block user Vincent Lefèvre from 'silly reverts' ==

I am not the only user who is annoyed by stupid aggressive deletions by the user Vincent Lefèvre, see his talk page. Is there a way to stop this blockwart behavior?