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   [ FAQ : (updated) how to write math symbols? ]
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Icarus
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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #25 on: Aug 18th, 2003, 4:51pm »
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I've wondered about that too. It would be nice if there was a standard way to create images that are stored locally, rather than on someone's remote site. (I suppose we could e-mail them to you and request that you insert them in the appropriate posts, but this seems like a lot of hassle.)
 
Of course there are all sorts of abuse issues that would have to be dealt with. And I also hate to sound like I'm demanding more when you've just done a fantastic service for the denizens of your forum! Whatever happens, what you have done already is great!
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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #26 on: Aug 18th, 2003, 7:31pm »
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I've noticed that whenever I place a symbol by clicking on its image in the window, I don't get just the symbol code itself, but also a leading space. This is has been annoying to me, as I usually have to go back and delete the space, having already supplied the spacing I wanted. (I've been "upgrading" some of my more symbol-heavy posts, so I have done a lot of this. I think it will make it easier reading for anyone brave enough to slog thru - though I mourn the loss of a reason to call w "omega in disguise". Cry)
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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #27 on: Aug 19th, 2003, 2:49am »
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on Aug 18th, 2003, 4:51pm, Icarus wrote:

Of course there are all sorts of abuse issues that would have to be dealt with.
The main problem would be to check if something is actually an image and/or make sure it can't be executed (neither serverside nor clientside). There are several ways to check the format so that shouldn't be to much of a problem.
A second problem would be people trying to use the forum as an imageserver and posting f.i. porn. This could be solved by only allowing the localized images to be refered to from this site (this can be done in a .htaccess file , if allowed).
 
Quote:
And I also hate to sound like I'm demanding more when you've just done a fantastic service for the denizens of your forum! Whatever happens, what you have done already is great!
*nods in agreement*
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william wu
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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #28 on: Aug 19th, 2003, 3:23pm »
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on Aug 18th, 2003, 7:37am, towr wrote:

If you want you could have the source and try to run it on your own site. (Provided this server runs on unix or linux and has PHP)
 
Also, it should be possible to localize images when they're posted to this forum, but that would require some extra scripting.

 
OK, perhaps I will try that when I get a chance. Thanks towr!  
 
Icarus: Space problem noted. In the meantime, you might prefer to type out the codewords instead of using the image clicking method. And don't worry about demanding more at all -- I wouldn't have it any other way Smiley Besides, I have already felt for a long time that the site needs to be drastically improved ... there are lots of plans in my head that still need to be implemented. I hope to have some sort of image upload feature in the near future.
« Last Edit: Aug 19th, 2003, 3:26pm by william wu » IP Logged


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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #29 on: Aug 21st, 2003, 11:53pm »
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file attachments are supported now. theoretically someone could still upload a disturbing image, and there's no program I can write to filter that out.  
 
as a small precautionary measure, image attachments are not automatically displayed in their respective posts. rather, all you see is a link in the post header, right next to an image of a paper clip. to view the image you will have to click that link.  
 
note that the img tags alone already provide sufficent opportunity for disastrous abuse, since one can reference images stored on other sites. so perhaps i should just allow automatic display of image attachments? except for two or three incidents, the forum atmosphere has always been surprisingly good-natured and mature, as noted in carl cox's study.
 
in any case, in the event that something unacceptable is attached, contact me and i will have the post removed, and the poster's IP banned.
 


edit 7:06 AM 8/23/2003: i decided to allow auto-display of image attachments
« Last Edit: Aug 23rd, 2003, 7:07am by william wu » IP Logged


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James Fingas
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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #30 on: Aug 22nd, 2003, 6:50am »
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Is there a way to edit the attachment besides deleting your post and starting again? I didn't see anything on the Modify page.
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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #31 on: Aug 22nd, 2003, 11:27am »
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I found myself writing sqr(2) in a post today. Any chance of a radical symbol?
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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #32 on: Aug 23rd, 2003, 7:56am »
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Sir Col: Enclosing "sqrt" in brackets will now produce the square root symbol. Equivalently one can embrace the LaTeX keyword "surd" in brackets, but surd is a weird abbreviation that I can't make sense of, so I added sqrt as well.
 
1. [sqrt][pi]
2. [surd][gamma]
3. [smiley=surd.gif]2
 
Code:

1. [sqrt][pi]
2. [surd][gamma]
3. [smiley=surd.gif]2

 


JF: Currently there is no way to modify an attachment. There's also a bug that occurs when threads with attachments are moved. I will try to look into these issues later. Time for Saturday morning cartoons Smiley
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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #33 on: Aug 23rd, 2003, 8:18am »
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Much obliged, William. I may [sqrt] out some of my older posts to update them.
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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #34 on: Oct 30th, 2003, 11:08pm »
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Quote:
surd is a weird abbreviation that I can't make sense of

 
Actually surd isn't an abbreviation; it's an old word for the root symbol or for an irrational number. Most references on the Web only give the "irrational number" definition, but see http://whatis.techtarget.com/definition/0,,sid9_gci870727,00.html for both.
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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #35 on: Oct 31st, 2003, 12:11am »
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I see. Incidentally, I found out a few weeks ago that when using Maple, you type surd to get the principal real root of a number.
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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #36 on: May 19th, 2004, 6:04pm »
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Can someone show me how to write the symbol for pi?
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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #37 on: May 19th, 2004, 6:56pm »
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on May 19th, 2004, 6:04pm, laura winebrinner wrote:
Can someone show me how to write the symbol for pi?

Yes, it is simply 'the symbol for pi?'.   Grin
 
But seriously, after clicking the hyperlink 'Reply' (below) you can click on the hyperlink 'View All Symbols' on the left of the next page. This will bring up a box of mathematical symbols, arranged in alphabetical order by name.
Just place your cursor where in your post you want the symbol, and click on the symbol you want.  
 
For [smiley=pi.gif] you can simply write the following code:
Code:
[pi]

 
« Last Edit: Jul 16th, 2006, 3:02am by ThudnBlunder » IP Logged

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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #38 on: May 19th, 2004, 7:15pm »
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Of course, it is easier to click on the selection bar at the top if that side window, and scroll down until you see pi. Select it, and the pi symbol appears in the window. Click on the figure, and the code for [pi] appears in your text box.
 
And of course, an easier method yet is simply to type [pi] in your text. The others are needed only if you don't know the name for your symbol.
 
Another trick you might want to be aware of: Anytime you see someone do something that you would like to do yourself, you can see his or her secrets: Simply click on the QUOTE link, and his or her entire post in its raw form (other than quotes within it, Yabb refuses to nest quotes) will appear within your quote. Once you see what you need, back your browser up or go somewhere else: you can always leave without posting.
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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #39 on: May 9th, 2005, 5:52am »
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You can to write math symbols via mailer Scientific Letter (Scientific software link). It mailer allows to create mail messages with math equations and send it in LaTeX notation  Wink
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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #40 on: May 9th, 2005, 6:53am »
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I don't think an application for email messages is really helpfull on a forum.  
Certainly we could do with something with a nice interface and such, but it would still at the end have to work online and on the forum.
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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #41 on: Dec 25th, 2005, 6:22pm »
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It is still possible to post symbols from the math symbolry that William added to the previous version of YaBB. The gifs are still there, but unfortunately, they are not recognized as smilies. Instead, you can post them using the [img] [/img] tags. Just place the full path to the appropriate symbol. The symbols are all located in
 
http://www.ocf.berkeley.edu/~wwu/YaBBImages/symbols/
 
Which can be completed with any of the files listed in the directory (I am unable to view them directly, but they work okay when posted as an image).
 
For example,  
Code:
[img]http://www.ocf.berkeley.edu/~wwu/YaBBImages/symbols/infty.gif[/img]
displays .
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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #42 on: Dec 26th, 2005, 8:25am »
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Based on Icarus' discovery above, for those of you using Firefox with Greasemonkey, I've written a user script to put all the math symbols back in the old posts when you're viewing them.  Just right-click on the words "user script" and select "Install User Script..." from the context menu.
 
Enjoy!
 
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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #43 on: Dec 26th, 2005, 10:07am »
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That's great Smiley
 
Too bad it doesn't work for those who don't have firefox though..
 
[e]It's just javascript right? So you could compress it to a one liner, and have it as a bookmark.[/e]
« Last Edit: Dec 27th, 2005, 12:56am by towr » IP Logged

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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #44 on: Dec 27th, 2005, 12:58am »
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The script seems to try to make images from anything between square brackets. Which is a problem for array indices, and bad tag use like [hide][/hide].
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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #45 on: Dec 27th, 2005, 5:15am »
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Not anything, just anything which is a single word beginning with a lowercase letter and containing only lowercase letters and digits.  Unless somebody has a list of all and only the symbols William created shortcuts for (as opposed to the smiley= syntax), I don't see how to do any better...  recommendations are welcome!
 
[edit]OK, try reloading the script and see what you think: it now ignores single-character escapes (which should handle array indexes) and all standard YaBB escapes, along with 'hide', 'hideb', and the often-used 'edit'.  It also titles the images so if you hover over a broken image (or, for that matter, any replaced image) you can see the original code.[/edit]
 
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« Last Edit: Dec 27th, 2005, 5:54am by SMQ » IP Logged

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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #46 on: Dec 27th, 2005, 7:55am »
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Yep, this seems to work nicely.
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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #47 on: Dec 27th, 2005, 8:16am »
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Actually, it needed one more tweek yet; it was leaving things like 'subi' unconverted because the check for 'sub' was erroniously matching.  Updated once again. Smiley
 
Also, there seems to be something called Trixie which claimes to offer Greasemonkey functionality under IE, but I don't know anything about it...
 
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Re: [ FAQ : (updated) how to write math symbols? ]  
« Reply #48 on: Jul 16th, 2006, 7:16am »
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And things have come to a pretty pass when Grimbal is reduced to using ordinary gifs for his avatars!     Shocked
« Last Edit: Jul 16th, 2006, 7:45pm by ThudnBlunder » IP Logged

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An update to posting mathsymbols  
« Reply #49 on: Jan 18th, 2007, 11:06am »
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A short summary/update
 
The list of symbol images available on this site can be found at http://www.ocf.berkeley.edu/~wwu/YaBBImages/symbols/
 
If you have Firefox, and install the Greasemonkey extension, then you will be able to make use of the following userscripts.
 
SMQ's script will transform the symbol tags in old posts to their respective images.  
 
My script will add a button on the post/modify page that will translate symbol names between $$ to image tags pointing to the url where that symbol supposedly is. So $int$ will be translated into [img]http://www.ocf.berkeley.edu/~wwu/YaBBImages/symbols/int.gif[/img], which will show up as
Do mind that it simply places the given name in the url, and doesn't check whether it's actually a symbol.
« Last Edit: Jan 18th, 2007, 11:07am by towr » IP Logged

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