Btukfyl

I want to create beamer slides but I frequently need to change the margins of my frames using the commands (thanks to samcarter for providing the original code)

% Page wide frame

makeatletter

    defGm@lmargin{widthTextMarginLeftPageWide}%

    defGm@rmargin{widthTextMarginRightPageWide}%

    textwidth=dimexprpaperwidth-Gm@lmargin-Gm@rmarginrelax

    hsizetextwidth

    columnwidthtextwidth

    hoffset=dimexpr-beamer@leftsidebar+Gm@lmargin-widthTextMarginLeftPageWiderelax

makeatother

I tried to store it in a shorter form as follows

newcommand{framePageWide}{<the code above>}

But I get the error "@Gm does not match its definition"

documentclass[aspectratio=169, xcolor={x11names}]{beamer}



usecolortheme{seahorse}

useoutertheme{split}

useinnertheme{inmargin}



newlength{widthTextMarginLeftPageWide}

setlength{widthTextMarginLeftPageWide}{5mm}

newlength{widthTextMarginRightPageWide}

setlength{widthTextMarginRightPageWide}{5mm}



newcommand{framePageWide}{}



begin{document}



{



% Page wide frame

makeatletter

    defGm@lmargin{widthTextMarginLeftPageWide}%

    defGm@rmargin{widthTextMarginRightPageWide}%

    textwidth=dimexprpaperwidth-Gm@lmargin-Gm@rmarginrelax

    hsizetextwidth

    columnwidthtextwidth

    hoffset=dimexpr-beamer@leftsidebar+Gm@lmargin-widthTextMarginLeftPageWiderelax

makeatother



begin{frame}

frametitle{Minipages in beamer}



rule{textwidth}{1pt}



    begin{columns}[T,onlytextwidth]



        column{0.45textwidth}

        rule{textwidth}{1pt}



        column{0.45textwidth}

        rule{textwidth}{1pt}  



    end{columns}



end{frame}



}





end{document}

As I indicated in my original comment, the makeatletter and makeatother surround the actual definition, rather than surrounding the content of the definition. That is to say,

YES:

makeatletternewcommandframePageWide{...}makeatother

NO:

newcommandframePageWide{makeatletter...makeatother}

The MWE

documentclass[aspectratio=169, xcolor={x11names}]{beamer}



usecolortheme{seahorse}

useoutertheme{split}

useinnertheme{inmargin}



newlength{widthTextMarginLeftPageWide}

setlength{widthTextMarginLeftPageWide}{5mm}

newlength{widthTextMarginRightPageWide}

setlength{widthTextMarginRightPageWide}{5mm}



makeatletter

newcommand{framePageWide}{%   

    defGm@lmargin{widthTextMarginLeftPageWide}%

    defGm@rmargin{widthTextMarginRightPageWide}%

    textwidth=dimexprpaperwidth-Gm@lmargin-Gm@rmarginrelax

    hsizetextwidthrelax

    columnwidthtextwidthrelax

    hoffset=dimexpr-beamer@leftsidebar+Gm@lmargin-widthTextMarginLeftPageWiderelax

}

makeatother



begin{document}



{framePageWide



% Page wide frame



begin{frame}

frametitle{Minipages in beamer}



rule{textwidth}{1pt}



    begin{columns}[T,onlytextwidth]



        column{0.45textwidth}

        rule{textwidth}{1pt}



        column{0.45textwidth}

        rule{textwidth}{1pt}  



    end{columns}



end{frame}



}





end{document}

Without the framePageWide, one gets