Talk:Cylindrical coordinate system

message: The article doesn't show the directions of ρ, φ, z vectors.  —Preceding unsigned comment added by 187.58.12.119 (talk) 13:39, 14 June 2010 (UTC)
replies: text: It's kind of astonishing that this comment has been here for more than a decade and no one has made an attempt to add the meanings of the symbols \boldsymbol{\hat{\rho}} , \boldsymbol{\hat{\varphi}}  , \mathbf{\hat{z}} to the article :(. JBL (talk) 01:06, 29 November 2022 (UTC)
thread_title: Direction

message: This needs a discussion regarding the alternate convention used by physicsts: rho and phi instead of r and theta. [Unsigned comment by User:Starwed on 2006-02-0 T10:44:46]
: Done, I hope. --Jorge Stolfi (talk) 22:36, 2 August 2009 (UTC)
thread_title: Physics convention

message: I have adapted the notation to the standard ISO notation (ρ,φ,z). I think the article should be expanded to include the relation with spherical coordinates, while the parts about cylindrical harmonics perhaps should go to an independent article. Gonfer (talk) 17:17, 2 February 2008 (UTC)
replies: text: I agree with everything you mention above. PAR (talk) 23:05, 2 February 2008 (UTC)
replies: text:  Done, I believe. --Jorge Stolfi (talk) 22:36, 2 August 2009 (UTC)
thread_title: ISO notation

message: There are now *three* images illustrating the concept.  Methinks that is too much. It would not be proper for me to vote on my own contribution; but, of the other two, I would rather remove the animated gif. Animated images in general are not good: they force the reader to stop reading in order to look at them, and keep "pulling the eye" even after the reader has looked at them.  Metinks that an animated image should be displayed only when the reader explicitly asks to see it, e.g. by clicking on a wikilink or external link.  All the best, --Jorge Stolfi (talk) 22:36, 2 August 2009 (UTC)
thread_title: Too many images

message: My textbook (Calculus Early Transcendentals, 5e by James Stewart [Published through Thomson|Brooks/Cole]) tells me that the cylindrical coordinates are (r, θ, z) and spherical coordinates are (ρ, θ, φ).  Was there an update to the standards and this wiki page is up to date, OR is the book right? --Charles Timko  —Preceding unsigned comment added by 128.211.207.28 (talk) 03:48, 28 October 2009 (UTC)
thread_title: Textbook Mismatch

message: In conversions: I think it should be arcsin(y/x) instead of y/ρ but I am no professional --91.113.28.31 (talk) 23:11, 18 November 2009 (UTC)
replies: text: * I didn't mean arcsin or arctan but x instead of ρ --81.217.4.39 (talk) 11:26, 19 November 2009 (UTC)
replies: text: * That is what I understood. It is /x if you use arctan, but /ρ if you use arcsin. (But in either case you need to test signs and handle two cases.) --Jorge Stolfi (talk) 15:02, 19 November 2009 (UTC)
thread_title:  A mistake? 

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thread_title:  External links modified 

message: The article mentions ISO 31-11:1992, but it has been revised in 2019 in ISO 80000-2:2019.
This standard still defines (ρ, φ, z) for coordinates in item n° 2-16.2 and indicates it's an update for item 11-12.2 from ISO 31.
It adds in remark that it uses an orthonormal right-handed system, again like previously.
So we could directly note ISO 80000-2 in the article instead of ISO 31-11 I guess. --Dereckson (talk) 15:17, 21 January 2022 (UTC)
thread_title:  ISO convention update