Re: [NTG-context] Position of prime for derivatives

Hi Hans, Thanks for your explanations. When using constructions such as $f’’_2(x)$, I will adapt my input in order to get what seems correct. Best regards: OK

On 17 May 2017, at 17:17, Hans Hagen wrote:

On 5/17/2017 8:35 AM, Otared Kavian wrote:

...

Hi Hans,

Thanks for having fixed the behavior of the prime in the latest beta release (ConTeXt version 2017.05.15 21:48). However, as you may see in the two attached PDF files, the result is still incorrect when one types for example $f_2’’(x)$, which should give the same result as $f’’_2(x)$. The correct behaviour is that obtained with mkii. Indeed one can circumvent the behaviour of the latest beta release of mkiv by using tricks such as the ones in the example code below, but this should be avoided in my opinion.

well, it depends on how one sees this '' mess

the problem with primes is that in macro packages they are messy entities that should collapse or not (active char mess) and the more clever a macro packages becomes the harder it becomes to makes it robust and/or to fight against such heuristics

add to that the fact that the symbol itself is a funny positioned something already raised in a font or not i.e. sometimes in need of superscript and sometimes explicitly not

for unicode we need to turn two '' into a double and ''' into a and triple such

that said, in context these thingies are at some point intercepted and their current state is looked at: superscript? multipel in a row? one ebing the nucleus of another ... etc .. the current (working again) behavior is what we support and i don't look forward to more heuristics

...

The following PDF have been obtained with mkii and mkiv with the following example code. Best regards: OK

%%% begin derivatives-prime.tex \starttext

\startformula f''_{2}(x) = f_{2}''(x) = f^{''}_{2}(x) = f_{2}^{''}(x) % = f^{{}^{''}}_{2}(x) \stopformula As one may see the result of \type{f_{2}''(x) = } $f_{2}''(x)$ is not correct in \type{mkiv}.

The following positions of the superscripts \type{(3)} are correct both in \type{mkii} and in \type{mkiv}. \startformula f^{(3)}_{2}(x) = f_{2}^{(3)}(x) \stopformula

\stoptext %%% end derivatives-prime.tex

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