mjhjmtu

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 :

documentclassstandalone
usepackagepgfplots

begindocument

defT10
defK10

begintikzpicture
 tikzstyleBode=
 tikzstyleAsymp=[red,densely dashed,thick=1pt]
 tikzstyleLieuReel=[thick=1pt]

 defFloorWfloor(ln(1/T)/ln(10))
 defCeilWceil(ln(1/T)/ln(10))
 defGdbK20*ln(K)/ln(10)

 beginsemilogxaxis[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]; 
 endsemilogxaxis
endtikzpicture

enddocument

Now, I put the style of my semilogaxis in the tikzstyleBode and type Bode in it instead

tikzstyleBode=[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)]
 ...
beginsemilogxaxis[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.... endsemilogxaxis

Can you help me ?

tikzstylefoo=[..] or the replacement tikzsetfoo/.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 pgfplotssetfoo/.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.

documentclassstandalone
usepackagepgfplots

begindocument

newcommandT10
newcommandK10

begintikzpicture[
 Asymp/.style=red,densely dashed,thick=1pt,
 LieuReel/.style=thick=1pt
 ]


 newcommandFloorWfloor(ln(1/T)/ln(10))
 newcommandCeilWceil(ln(1/T)/ln(10))
 newcommandGdbK20*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)
 
 beginsemilogxaxis[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]; 
 endsemilogxaxis
endtikzpicture

enddocument