I got exactly the same text in Chrome as Miller got in Firefox.
Your problem seems not so much translating html in J, but translating (La)Tex
in J-ish, as you want
$\displaystyle a_{n+1}=a_n-\frac 1 {a_n}$ for any $n \ge 0$.
be translated in
NB. a[n+1] =an - 1/an for any n >: 0.
AFAIK there is/was some experience in the forum to do so.
R.E. Boss
-----Original Message-----
From: General <[email protected]> On Behalf Of 'Michael Day'
via General
Sent: zondag 11 oktober 2020 21:10
To: [email protected]
Subject: Re: [Jgeneral] MathJax to Plain Text!?
I've been using "Avast Secure Browser" for some time, tried M/S Edge for a few
months, but used to use Firefox for many years!
Yes, I see that behaviour in Firefox + Noscript, too. It's a bit better than
what I had from copy&paste from the "HTML problem view" as available in the
variant view, eg
https://projecteuler.net/minimal=729
Still pretty kludgy. Looks as if I'll have to write my own conversions,
assuming the \ is an excape character introducing a MathJax code sequence, eg
\frac 1 2 ==> 1/2 (or
1%2 in proper J!), if I'm
to clean up the pasted version.
Thanks again,
Mike
On 11/10/2020 16:51, Raul Miller wrote:
> Oh, sorry, I misunderstood your question and difficulty.
>
> For something like that, I would use a browser which does not support
> javascript. (Firefox with the noscript extension installed,
> specifically, though a text only browser like lynx might work).
>
> Using that approach, here's what I got from copy and paste (without
> bothering with a text editor to clean it up):
>
> ----------------
>
> Consider the sequence of real numbers $a_n$ defined by the starting
> value $a_0$ and the recurrence $\displaystyle a_{n+1}=a_n-\frac 1
> {a_n}$ for any $n \ge 0$.
>
> For some starting values $a_0$ the sequence will be periodic. For
> example, $a_0=\sqrt{\frac 1 2}$ yields the sequence: $\sqrt{\frac 1
> 2},-\sqrt{\frac 1 2},\sqrt{\frac 1 2}, \dots$
>
> We are interested in the range of such a periodic sequence which is
> the difference between the maximum and minimum of the sequence. For
> example, the range of the sequence above would be $\sqrt{\frac 1
> 2}-(-\sqrt{\frac 1 2})=\sqrt{ 2}$.
>
> Let $S(P)$ be the sum of the ranges of all such periodic sequences
> with a period not exceeding $P$.
> For example, $S(2)=2\sqrt{2} \approx 2.8284$, being the sum of the
> ranges of the two sequences starting with $a_0=\sqrt{\frac 1 2}$ and
> $a_0=-\sqrt{\frac 1 2}$.
> You are given $S(3) \approx 14.6461$ and $S(5) \approx 124.1056$.
>
> Find $S(25)$, rounded to 4 decimal places.
>
> ----------------
>
> I hope this helps,
>
>
> --
> Raul
>
> On Sun, Oct 11, 2020 at 11:36 AM 'Michael Day' via General
> <[email protected]> wrote:
>> Thanks for the tip, Raul, but it doesn't fix the problem for me, at
>> least with my understanding of your remarks.
>>
>> I assume M/S Wordpad and Notepad are such editors, as you have in
>> mind, but I'm still not seeing the missing text with either. Pasting
>> into a Word-type document, actually into a blank Open Office page,
>> shows more of the text, but is still not terribly useful, since %:
>> 1%2 (as it were in plain J) becomes 12, still leaving a lot of
>> hand-editing to be done.
>>
>> Perhaps you could have a look at https://projecteuler.net/problem=729
>> to see how it works for you.
>>
>> Many regards,
>>
>> Mike
>>
>> On 11/10/2020 16:04, Raul Miller wrote:
>>> In general, for copy and paste problems, nowadays I paste into a
>>> plain text editor that does not support unicode, where I also fix
>>> any line length errors before copying and pasting into J.
>>>
>>> Unicode implementations, in their current state, are programming
>>> language hostile (more specifically, in the Unicode standard,
>>> there's lots of little recommendations about how programming
>>> languages implement Unicode which were made in ignorance of the languages).
>>>
>>> --
>>> Raul
>>>
>>>
>>>
>>> On Sun, Oct 11, 2020 at 9:10 AM 'Michael Day' via General
>>> <[email protected]> wrote:
>>>> I wonder - how do other J-users trying to solve Project Euler
>>>> problems cope with the (to me) fairly new display format, which is
>>>> apparently MathJax?
>>>>
>>>> Using Windows 10, copy&paste to get the problem statement into my
>>>> J edit screen used to be adequate to get it where I need it as a
>>>> set of NB. comment lines. I'd nearly always have to tweak the
>>>> quoted text, but it was manageable.
>>>>
>>>> It's now losing too much information, and it's tedious typing
>>>> everything in. I wasted time solving the relatively easy problem
>>>> 727 because I'd mis-typed 1 <: ra < rb < rc
>>>> <: 100 with <: everywhere.
>>>>
>>>> Here's a snippet from today's problem, 729, using the old method:
>>>> "Consider the sequence of real numbers [LF]
>>>> defined by the starting value [LF]
>>>> and the recurrence [LF]
>>>> [LF]
>>>> for any ."
>>>>
>>>> [I've typed in "[LF]" in this message quote to confirm the
>>>> gratuitous line-feeds which appear instead of marked-up text
>>>> elements, such as an, a0...]
>>>>
>>>> It's possible to capture the explicit markup code from the display,
>>>> using a widget tagged with
>>>> "Show HTML problem content"
>>>>
>>>> Here's the same paragraph using that view, ie copy&pasted from
>>>> problem 729, https://projecteuler.net/minimal=729
>>>>
>>>> "<p>Consider the sequence of real numbers $a_n$ defined by the
>>>> starting value $a_0$ and the recurrence
>>>>
>>>> $\displaystyle a_{n+1}=a_n-\frac 1 {a_n}$ for any $n \ge 0$.</p>
>>>>
>>>> <p>"
>>>>
>>>>
>>>> I'd like it to appear in the J script in plain-ish commented text, eg:
>>>>
>>>> NB. Consider the sequence of real numbers an defined by the
>>>> starting value a0 and the recurrence
>>>>
>>>> NB. a[n+1] =an - 1/an for any n >: 0.
>>>>
>>>>
>>>> SO - I can soldier on and work up a function or two to translate
>>>> the data from clipread (in JQt) ,
>>>>
>>>> but I've never seriously got into html, and suspect I'd be
>>>> reinventing the wheel from first principles when
>>>>
>>>> someone probably knows this stuff backwards and might even have
>>>> some suitable code.
>>>>
>>>>
>>>> BTW, Google has thrown up "pandoc", and J has addons/format/publish.
>>>> Both are file-based and don't work
>>>>
>>>> on clipboard data as far as I can see so far.
>>>>
>>>>
>>>> Thanks for any help,
>>>>
>>>>
>>>> Mike
>>>>
>>>>
>>>> PS - I've just checked behaviour on the iPad with J701 - copy&paste
>>>> on that kit has been pretty bad for some time;
>>>>
>>>> it doesn't lose the text, but uses a line feed with every character
>>>> in an escape sequence. eg
>>>>
>>>> "a_{n+1}= a_n " becomes
>>>>
>>>> "
>>>>
>>>>
>>>> a
>>>>
>>>> n
>>>>
>>>> +
>>>>
>>>> 1
>>>>
>>>> =
>>>>
>>>> a
>>>>
>>>> n
>>>>
>>>>
>>>> [etc]
>>>>
>>>> "
>>>>
>>>>
>>>>
>>>>
>>>>
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