I use an linux box (ubuntu) and I downloaded an application
by the name of:
PDF Editor which goes by the name of PDFedit.
I ran the program against the same portion of the .pdf file
and extracted the text for the formula that was so mangled.
I got:
m
(
ρ = unit : kg / m 3
V
)
still kind of mangled, but it is better.
In the original formula, the had a "m%V" term that was a
horizontal and slanted divide sign.
I got the ρ - rho this time, which was an improvement.
I think a lot strangeness will go away when I get the
correct font support. Maybe I should
install the APL font sets and some of the Mathematica font
sets.
----- Original Message Follows -----
From: [email protected]
To: Programming forum <[email protected]>
Subject: Re: [Jprogramming] math.pdf -> J Server -> math.ijs
file
Date: Sat, 20 Jun 2009 11:40:31 -0800
>
>----- Original Message Follows -----
>From: Devon McCormick <[email protected]>
>To: Programming forum <[email protected]>
>Subject: Re: [Jprogramming] math.pdf -> J Server ->
>math.ijs file
>Date: Fri, 19 Jun 2009 21:06:48 -0400
>
>> I searched for "physics formula" in Google,
>>grabbed the first PDF Ifound
>>(http://faculty.trinityvalleyschool.org/hoseltom/handouts/
>>F ormula%20Sheet-2003-05-07-8pg.pdf),opened it in Acrobat,
>>highlighted a formula for "Density = mass/volume"which
>was
>>written as something like: {rho} = m _
>>(unit:kg/m{exponent} 3) vand grabbed this
>>formula using the Acrobat selection tool. In a textwindow
>>, this pasted as(unit : kg /m3)Vñ = mSo that's one
>problem.
>
>I downloaded the same .pdf file and ran a
>free-pay-if-you-like-it
>program that extracts text from a .pdf file.
>
>My results for the same density function:
>
>#4 Weight = m<8f>g
> g = 9.81m/sec² near the surface of the Earth
>= 9.795 m/sec ² in Fort Worth, TX
> Density = mass / volume
>
>If I take this apart, #4 Weitht = m<8f>g is not
>correct because I don't have
>a definition for the round dot for multiplication
>
>the next line is correct
>the next line is correct
>
>The next line looks like a big mess.
>
>() 3 /: mkgunitV
>m= ?
>
>as you say, it should be:
>
>rho = m/V(unit:kg/m^3)
>
>But looking at it, the problem is the way the text was
>processed.
>
>every letter is there, it is the order that is bad.
>The "(" and ")" are there,
>the "/" is there,
>the "kg" is there,
>the "m" is there,
>the "3" is there the "V" is there.
>
>the reason the 3 is not displayed as an exponent is because
>of font support
>
>I am not sure where the rho went, but I think it has to do
>with not
>having the proper font support.
>
>If you have the proper fonts installed, everything will be
>displayed, and if one were to
>make the code process the text properly, your formula would
>be correct.
>
>
>>However, the deeper problem is that _there is nosuch thing
>>as a standard mathematical notation_. Even on the single
>>physicsformula page I looked at here, multiplication is
>>represented both implicitlyby adjacent letters and
>>explicitly by a big, vertically-centered dot.Even on this
>>one page, equality is parsed in differen t, inconsistent
>>ways.The intended meanings are clear from context and a
>>familiarity with physicsbut are ambiguous taken by
>>themselves. I could go on and on - take a look
>>athttp://www.jsoftware.com/jwiki/NYCJUG/MathematicalNotati
>>o n for a little moreon this - but I won't.
>
>I totally agree with you, this is pain in the ass.
>
>>This inconsistency of notation is, in fact, part ofthe
>reason
>>Iverson created APL in the first place.
>
>great idea from a great man.
>
>>The upshot is that
>>an idea like Dan's is probably more fruitful than
>>thisnotion of grabbing things off a PDF. Even then,
>>you'll need to spend a fairamount of time interpreting
>>what you get.
>
>I respectfully disagree. The program I am using does a
>fair job
>proving to me that it is fisable.
>
>>For a look at how someone handles a lot of formulas and
>>translates them intoJ, see Tom Allen's pages starting
>>athttp://www.jsoftware.com/jwiki/Essays/SpaceTime2D/SpaceT
>>i me2D01.Good luck,DevonOn Fri, Jun 19, 2009 at 8:24 PM,
>><[email protected]> wrote:> I do not plan to
>>use OCR.>> I am thinking more along the lines of cutting
>>and pasting a> section out of a> Portable Document Format
>>(pdf) file that represents in> normal> mathematical
>>notation a formula.>> Acter doing the copy, use
>>cut/paste buffer to generate> equivalent j code.>> As I
>>understand it ( probably wrong ) what is in the> cut/paste
>>buffer is a sequence> of bytes which represents in pdf the
>>formula. I am thinking> that different formulas> ( no
>>matter how little or how big the difference ) have>
>>different bytes. So, no matter> how difficult, one should
>>be able to transcribe from pdf> representation to j
>>representation.>> I think it would be way cool (1960s
>>euphemism) to go to a> web page containing formula> for
>>Physics and copy a pdf version of a formula and then> turn
>>it into the j representation> automatically.>> -----
>>Original Message Follows -----> From: bill lam
>><[email protected]>> To: [email protected]>
>>Subject: Re: [Jprogramming] math.pdf -> J Server ->
>>math.ijs> file> Date: Fri, 19 Jun 2009 10:09:30 +0800>>
>>>Except for the ocr part, looks similar to mathematica.>
>>>> >btw the 'Quality' Web Email you used breaks every
>>>thread it> >replies.> >> >--> regards,>
>>>====>===============================================>
GPG
>>key 1024D/4434BAB3 2008-08-24> >gpg --keyserver
>>subkeys.pgp.net --recv-keys 4434BAB3>
>>>---------------------------------------------------------
>>- -> >----------- For information about J forums see>
>>>http://www.jsoftware.com/forums.htm>
>>----------------------------------------------------------
>>- -----------> For information about J forums see
>>http://www.jsoftware.com/forums.htm>-- Devon McCormick,
>>CFA^me^ at acm.org is mypreferred
>>e-mail----------------------------------------------------
>>- -----------------For information about J forums see
>>http://www.jsoftware.com/forums.htm
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