Re: [NTG-context] mathradical defaults to "normal", should it perhaps be "default"?

[Alan BRASLAU]

On Wed, 7 Jun 2017 18:03:35 +0200
Hans Hagen  wrote:

> > I have been massacred on this list for ever preferring \over to
> > \frac...  
> 
> and because of the many {} you then need you get these mismatch
> errors ... but, you can make
> 
> \unexpanded\def\fakefrac#1#2{{{#1}\over{#2}}}

The syntax {a \over b} is much more readable (to a mathematician) than
\frac{a}{b} which looks fine to a programmer.

This has nothing to say about how one or the other performs, it is a
purely syntactical preference.

Alan
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Re: [NTG-context] mathradical defaults to "normal", should it perhaps be "default"?

[Mikael P. Sundqvist]

On Wed, Jun 7, 2017 at 7:31 PM, Hans Hagen  wrote:
> On 6/7/2017 4:50 PM, Mikael P. Sundqvist wrote:
>>
>> On Mon, Jun 5, 2017 at 10:24 AM, Mikael P. Sundqvist 
>> wrote:
>>>
>>> Hi,
>>>
>>> this might be a matter of taste.
>>>
>>> look at the output of (attached). In my opinion the first square root
>>> is to "high", while it looks better on the second line. From
>>> setup-en.pdf it looks like the default of \setupmathradical is set to
>>> normal (and not default). I don't understand what normal should mean,
>>> but I think the alternative=default looks better. (The lucida fonts
>>> are loaded in this example, since the effect is more clear for them).
>
> Ok, this is the story
>
> -- radicals (roots) are rather special and have some hard coded properties
> (like always scriptscript in the degree)
>
> -- \over (and friends) that are used in \frac (which by the way can be
> configured in many ways) has the danger of getting the wrong style as side
> effect of parsing (math list construction) and processing
>
> -- in context we want to support color etc for noth in a consistent way as
> well as style control (important in educational math)
>
> Normally it works out ok with the 'normal' setting but there is some catch
> here. The size of the radical symbols is determine by
>
> -- RadicalVerticalGap =  50
> -- RadicalDisplayStyleVerticalGap = 175
>
> (These are lucide values) and it happens that the second one if too large
> which can give a bad threshold in our case. In cambria it's
>
> RadicalVerticalGap = 166
> RadicalDisplayStyleVerticalGap = 345
>
> So a 1:2 ratio. If we use that for lucida it looks better, so
>
>   lucida-opentype-math.lfg
>
> can become:
>
> local function FixRadicalDisplayStyleVerticalGap(value,target,original)
> local o = original.mathparameters.RadicalVerticalGap -- 50
> return 2 * o * target.parameters.factor
> end
>
> return {
> name = "lucida-opentype-math",
> version = "1.00",
> comment = "Goodies that complement lucida opentype.",
> author = "Hans Hagen",
> copyright = "ConTeXt development team",
> mathematics = {
> parameters = {
> RadicalDisplayStyleVerticalGap =
> FixRadicalDisplayStyleVerticalGap,
> },
> alternates = {
> italic   = { feature = 'ss01', value = 1, comment =
> "Mathematical Alternative Lowercase Italic" },
> arrow= { feature = 'ss02', value = 1, comment =
> "Mathematical Alternative Smaller Arrows" },
> operator = { feature = 'ss03', value = 1, comment =
> "Mathematical Alternative Smaller Operators" },
> calligraphic = { feature = 'ss04', value = 1, comment =
> "Mathematical Alternative Calligraphic Characters" },
> zero = { feature = 'ss05', value = 1, comment =
> "Mathematical Alternative Zero" },
> partial  = { feature = 'ss20', value = 1, comment =
> "Mathematical Alternative Upright Partial Differential" },
> },
> },
> }
>
> It's sort of a font property: the more sizes the better and sometimes you're
> simply hit by the threshold not suiting your case.
>
>
> Hans
>
> -
>   Hans Hagen | PRAGMA ADE
>   Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> -
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Hans,

many thanks for your explanation, it is really appreciated when you
take your time to do this!

I updated my local lucida-opentype-math.lfg and indeed it works like
charm. I think the uncramped version I get now looks better than what
I forced with the temporary solution that I did not understand.

/Mikael
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Re: [NTG-context] mathradical defaults to "normal", should it perhaps be "default"?

[Hans Hagen]

On 6/7/2017 4:50 PM, Mikael P. Sundqvist wrote:

On Mon, Jun 5, 2017 at 10:24 AM, Mikael P. Sundqvist  wrote:

Hi,

this might be a matter of taste.

look at the output of (attached). In my opinion the first square root
is to "high", while it looks better on the second line. From
setup-en.pdf it looks like the default of \setupmathradical is set to
normal (and not default). I don't understand what normal should mean,
but I think the alternative=default looks better. (The lucida fonts
are loaded in this example, since the effect is more clear for them).

Ok, this is the story

-- radicals (roots) are rather special and have some hard coded 
properties (like always scriptscript in the degree)


-- \over (and friends) that are used in \frac (which by the way can be 
configured in many ways) has the danger of getting the wrong style as 
side effect of parsing (math list construction) and processing


-- in context we want to support color etc for noth in a consistent way 
as well as style control (important in educational math)


Normally it works out ok with the 'normal' setting but there is some 
catch here. The size of the radical symbols is determine by


-- RadicalVerticalGap =  50
-- RadicalDisplayStyleVerticalGap = 175

(These are lucide values) and it happens that the second one if too 
large which can give a bad threshold in our case. In cambria it's


RadicalVerticalGap = 166
RadicalDisplayStyleVerticalGap = 345

So a 1:2 ratio. If we use that for lucida it looks better, so

  lucida-opentype-math.lfg

can become:

local function FixRadicalDisplayStyleVerticalGap(value,target,original)
local o = original.mathparameters.RadicalVerticalGap -- 50
return 2 * o * target.parameters.factor
end

return {
name = "lucida-opentype-math",
version = "1.00",
comment = "Goodies that complement lucida opentype.",
author = "Hans Hagen",
copyright = "ConTeXt development team",
mathematics = {
parameters = {
RadicalDisplayStyleVerticalGap = 
FixRadicalDisplayStyleVerticalGap,

},
alternates = {
italic   = { feature = 'ss01', value = 1, comment = 
"Mathematical Alternative Lowercase Italic" },
arrow= { feature = 'ss02', value = 1, comment = 
"Mathematical Alternative Smaller Arrows" },
operator = { feature = 'ss03', value = 1, comment = 
"Mathematical Alternative Smaller Operators" },
calligraphic = { feature = 'ss04', value = 1, comment = 
"Mathematical Alternative Calligraphic Characters" },
zero = { feature = 'ss05', value = 1, comment = 
"Mathematical Alternative Zero" },
partial  = { feature = 'ss20', value = 1, comment = 
"Mathematical Alternative Upright Partial Differential" },

},
},
}

It's sort of a font property: the more sizes the better and sometimes 
you're simply hit by the threshold not suiting your case.


Hans

-
  Hans Hagen | PRAGMA ADE
  Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
   tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-
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Re: [NTG-context] mathradical defaults to "normal", should it perhaps be "default"?

[Hans Hagen]

On 6/7/2017 5:12 PM, Otared Kavian wrote:

Hi,

Indeed using \frac yields a weird result in the example sent by Mikael.
Compare the output of the three formulas below, with or without 
\setupmathradical[sqrt][alternative=default].


The results are correct using \over in both cases, while the first one 
is weird when using \frac and \setupmathradical[sqrt][alternative=default].


Best regards: OK
%%% start of test file
\starttext
\startbuffer[math]
\startformula
\sqrt{1+\Bigl(\frac{f(x_k)-f(x_{k-1})}{x_k-x_{k-1}}\Bigr)^2}
\stopformula

\startformula
1+\Bigl(\frac{f(x_k)-f(x_{k-1})}{x_k-x_{k-1}}\Bigr)^2
\stopformula

\startformula
\sqrt{1+\Bigl({f(x_k)-f(x_{k-1}) \over x_k - x_{k-1}}\Bigr)^2}
\stopformula
\stopbuffer

\getbuffer[math]
\hairline

\setupmathradical[sqrt][alternative=default]

\getbuffer[math]

\stoptext

interesting side effect of Ustack (i'll look at it)

Hans

-
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Re: [NTG-context] mathradical defaults to "normal", should it perhaps be "default"?

[Hans Hagen]

On 6/7/2017 5:45 PM, Alan BRASLAU wrote:

On Wed, 7 Jun 2017 17:12:44 +0200
Otared Kavian  wrote:


The results are correct using \over in both cases, while the first
one is weird when using \frac and


I have been massacred on this list for ever preferring \over to \frac...


and because of the many {} you then need you get these mismatch errors 
... but, you can make


\unexpanded\def\fakefrac#1#2{{{#1}\over{#2}}}

-
  Hans Hagen | PRAGMA ADE
  Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
   tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-
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Re: [NTG-context] mathradical defaults to "normal", should it perhaps be "default"?

[Meer, Hans van der]

> On 7 Jun 2017, at 17:45, Alan BRASLAU  wrote:
> 
> On Wed, 7 Jun 2017 17:12:44 +0200
> Otared Kavian  wrote:
> 
>> The results are correct using \over in both cases, while the first
>> one is weird when using \frac and 
> 


> I have been massacred on this list for ever preferring \over to \frac...

Do not be sad, we will bring flowers to console you - some of us do not hate 
\over  ;-) ;-) ;-)

> __

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Re: [NTG-context] mathradical defaults to "normal", should it perhaps be "default"?

[Alan BRASLAU]

On Wed, 7 Jun 2017 17:12:44 +0200
Otared Kavian  wrote:

> The results are correct using \over in both cases, while the first
> one is weird when using \frac and 

I have been massacred on this list for ever preferring \over to \frac...
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Re: [NTG-context] mathradical defaults to "normal", should it perhaps be "default"?

[Otared Kavian]

Hi,

Indeed using \frac yields a weird result in the example sent by Mikael.
Compare the output of the three formulas below, with or without 
\setupmathradical[sqrt][alternative=default].

The results are correct using \over in both cases, while the first one is weird 
when using \frac and \setupmathradical[sqrt][alternative=default].

Best regards: OK
%%% start of test file
\starttext
\startbuffer[math]
\startformula
\sqrt{1+\Bigl(\frac{f(x_k)-f(x_{k-1})}{x_k-x_{k-1}}\Bigr)^2}
\stopformula

\startformula
1+\Bigl(\frac{f(x_k)-f(x_{k-1})}{x_k-x_{k-1}}\Bigr)^2
\stopformula

\startformula
\sqrt{1+\Bigl({f(x_k)-f(x_{k-1}) \over x_k - x_{k-1}}\Bigr)^2}
\stopformula
\stopbuffer

\getbuffer[math]
\hairline

\setupmathradical[sqrt][alternative=default]

\getbuffer[math]

\stoptext
%%% end of test file


> On 7 Jun 2017, at 16:50, Mikael P. Sundqvist  wrote:
>> […]
> 
> Hans,
> 
> maybe the \setupmathradical[sqrt][alternative=default] was not so
> successful after all. Or maybe this is a bug:
> 
> %%% start of test file
> \setupmathradical[sqrt][alternative=default]
> 
> \starttext
> \startformula
> \sqrt{1+\Bigl(\frac{f(x_k)-f(x_{k-1})}{x_k-x_{k-1}}\Bigr)^2}
> \stopformula
> \stoptext
> %%% stop of test file
> 
> The numerator looks too small in my opinion. Compiled with 2017.06.06 13:22.
> 
> /Mikael
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Re: [NTG-context] mathradical defaults to "normal", should it perhaps be "default"?

[Mikael P. Sundqvist]

On Mon, Jun 5, 2017 at 10:24 AM, Mikael P. Sundqvist  wrote:
> Hi,
>
> this might be a matter of taste.
>
> look at the output of (attached). In my opinion the first square root
> is to "high", while it looks better on the second line. From
> setup-en.pdf it looks like the default of \setupmathradical is set to
> normal (and not default). I don't understand what normal should mean,
> but I think the alternative=default looks better. (The lucida fonts
> are loaded in this example, since the effect is more clear for them).
>
> /Mikael
>
> \setupbodyfont[lucidaot]
>
> \starttext
>
> \startTEXpage[offset=2pt]
> \startformula
> \sqrt{1+x^2}\neq \frac{1}{\sqrt{1+x^2}}
> \stopformula
>
> %the default setting for mathradical seems to be "normal". We change
> it to "normal"
> \setupmathradical[sqrt][alternative=default]
>
> \startformula
> \displaystyle\sqrt{1+x^2}\neq \frac{1}{\sqrt{1+x^2}}
> \stopformula
> \stopTEXpage
>
> \stoptext

Hans,

maybe the \setupmathradical[sqrt][alternative=default] was not so
successful after all. Or maybe this is a bug:

%%% start of test file
\setupmathradical[sqrt][alternative=default]

\starttext
\startformula
\sqrt{1+\Bigl(\frac{f(x_k)-f(x_{k-1})}{x_k-x_{k-1}}\Bigr)^2}
\stopformula
\stoptext
%%% stop of test file

The numerator looks too small in my opinion. Compiled with 2017.06.06 13:22.

/Mikael


ctx-example22.pdf
Description: Adobe PDF document
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