Bdtyk

I would like to pick your brains again on a small issue.

I want to use tikzstyle to describe the style of multiple plots but when I copy and paste the style I use on my plot, I get a compilation error.

Working code :

documentclass{standalone}

usepackage{pgfplots}



begin{document}



defT{10}

defK{10}



begin{tikzpicture}

    tikzstyle{Bode}=

    tikzstyle{Asymp}=[red,densely dashed,thick=1pt]

    tikzstyle{LieuReel}=[thick=1pt]



    defFloorW{floor(ln(1/T)/ln(10))}

    defCeilW{ceil(ln(1/T)/ln(10))}

    defGdbK{20*ln(K)/ln(10)}



    begin{semilogxaxis}[height=5cm,width=10cm,xlabel=$omega$,ylabel=$G_{dB}$,grid=both,axis x line=bottom, axis y line = left,ymax=(GdbK+4),xmax=10^(CeilW+2.2)]



        addplot [domain=(10^(FloorW-2)):(10^(CeilW+2)),samples=50] {GdbK-(10*(ln(T^2*x^2+1)))/ln(10)}[LieuReel];



        addplot [domain=(10^(FloorW-2)):(1/T),samples=2] {GdbK}[Asymp];

        addplot [domain=(1/T):(10^(CeilW+2)),samples=2] {GdbK-(10*(ln(T^2*x^2)))/ln(10)}[Asymp]; 

    end{semilogxaxis}

end{tikzpicture}



end{document}

Now, I put the style of my semilogaxis in the tikzstyle{Bode} and type Bode in it instead

tikzstyle{Bode}=[height=5cm,width=10cm,xlabel=$omega$,ylabel=$G_{dB}$,grid=both,axis x line=bottom, axis y line = left,ymax=(GdbK+4),xmax=10^(CeilW+2.2)]

     ...

begin{semilogxaxis}[Bode]

and it gets me this error:

! Package pgfkeys Error: I do not know the key '/tikz/height', to which you passed '5cm', and I am going to ignore it. Perhaps you misspelled it.See the pgfkeys package documentation for explanation.Type H <return> for immediate help.... end{semilogxaxis}

Can you help me ?

tikzstyle{foo}=[..] or the replacement tikzset{foo/.style={..}} looks in the /tikz family of keys, but width, height and the other axis parameters belong to the /pgfplots family, so you get an error that /tikz/width is unknown.

Instead you can use pgfplotsset{foo/.style={..}}, then the keys are assumed to be in the /pgfplots family.

By the way, in general it would be better to use newcommand instead of def, because then you won't accidentally overwrite existing macros.

documentclass{standalone}

usepackage{pgfplots}



begin{document}



newcommandT{10}

newcommandK{10}



begin{tikzpicture}[

  Asymp/.style={red,densely dashed,thick=1pt},

  LieuReel/.style={thick=1pt}

  ]





    newcommandFloorW{floor(ln(1/T)/ln(10))}

    newcommandCeilW{ceil(ln(1/T)/ln(10))}

    newcommandGdbK{20*ln(K)/ln(10)}

    pgfplotsset{

       bode/.style={

          height=5cm,

          width=10cm,

          xlabel=$omega$,

          ylabel=$G_{dB}$,

          grid=both,

          axis x line=bottom,

          axis y line = left,

          ymax=(GdbK+4),

          xmax=10^(CeilW+2.2)}

          }

    begin{semilogxaxis}[bode]



        addplot [domain=(10^(FloorW-2)):(10^(CeilW+2)),samples=50] {GdbK-(10*(ln(T^2*x^2+1)))/ln(10)}[LieuReel];



        addplot [domain=(10^(FloorW-2)):(1/T),samples=2] {GdbK}[Asymp];

        addplot [domain=(1/T):(10^(CeilW+2)),samples=2] {GdbK-(10*(ln(T^2*x^2)))/ln(10)}[Asymp]; 

    end{semilogxaxis}

end{tikzpicture}



end{document}