Oblique cancellation with plain TeX

[David Carlisle]

it works for me with cancel.sty that starts
% cancel.sty  version  2.2  12-Apr-2013.
I don't think I have changed the graphics-pln in years (autopict.sty from
2001 being the last change I think)
stick \tracingall at the top of the file and send me the log off list, I'll
have a look

On Fri, 2 Aug 2019 at 20:17, Rodolfo Medina <rodolfo.medina at gmail.com>
wrote:

> Rodolfo Medina <rodolfo.medina at gmail.com> writes:
>
> > David Carlisle <d.p.carlisle at gmail.com> writes:
> >
> >> \input picture
> >> \catcode`\@=11
> >>
> >> \RequirePackage{cancel}
> >> \let\zzcancel\cancel
> >> \def\cancel#1{{%
> >> \let\line\LaTeX at line
> >> \zzcancel{#1}}}
> >>
> >> $\cancel{x^2 + 1}$
> >>
> >> $\cancel{a}$
> >>
> >> $\cancel{{x^2 + 1 \over b}}$
> >>
> >>
> >> \bye
> >
> >
> > Fantastic...!!
>
>
> Strange...  Now I'm on a different computer of mine and I get error:
>
> $ tex test
> This is TeX, Version 3.14159265 (TeX Live 2016/Debian) (preloaded
> format=tex)
> (./test.tex
> (/usr/share/texlive/texmf-dist/tex/plain/graphics-pln/picture.tex
> (/usr/share/texlive/texmf-dist/tex/plain/graphics-pln/miniltx.tex)
> (/usr/share/texlive/texmf-dist/tex/plain/graphics-pln/autopict.sty))
> (/usr/share/texlive/texmf-dist/tex/latex/cancel/cancel.sty)
> ! Undefined control sequence.
> \@cancel ...eight \unitlength \p@ \canc at thinlines
>                                                   {\/\raise \dimen@ \hbox
> {\...
>
> \mathpalette ...>\mathchoice {#1\displaystyle {#2}
>                                                   }{#1\textstyle
> {#2}}{#1\sc...
>
> \zzcancel ...lette {\@cancel {\@can at slash {}}}{#1}
>                                                   \else \@cancel
> {\@can at slas...
>
> \cancel #1->{\let \line \LaTeX at line \zzcancel {#1}
>                                                   }
> l.10 $\cancel{x^2 + 1}
>                       $
> ?
>
>
> Maybe a too old version of `picture'...?  In fact, on this PC, I have an
> older
> version of Debian...
>
> Thanks for any help,
>
> Cheers,
>
> Rodolfo
>
>
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