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illinguista1972″ post=84481Ecco un altro log, chiedo agli esperti di TikZ se conoscono l’errore in fondo.
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! Package pgf Error: No shape named current axis is known.

See the pgf package documentation for explanation.
Type H for immediate help.
…

l.116 \end{esempiopgf}

?`

Il codice che dà problemi è questo:
`\begingroup
\pgfplotsset{trim axis left}
\begin{esempiopgf}
\begin{tikzpicture}
\begin{axis}
\end{axis}
\end{tikzpicture}
\end{esempiopgf}
\endgroup
`
dove [tt]esempiopgf[/tt] è un ambiente di comodo definito per ripartire in un certo modo lo spazio tra codice e risultato. Se serve, ecco le impostazioni di pgfplots:
`\pgfplotsset{width=6.3cm,/pgf/number format/use comma,compat=1.8}`

Ciao
Tommaso

Il problema deriva dal fatto che [tt]trim axis left[/tt] è una chiave che ha come path [tt]/tikz/trim axis left[/tt] mentre il comando [tt]\pgfplotsset[/tt] imposta il path [tt]/pgfplots/[/tt]. Quindi la chiave non risulta conosciuta. Per ovviare devi fare: `
\begingroup
\begin{esempiopgf}
\begin{tikzpicture}[trim axis left]
\begin{axis}
\end{axis}
\end{tikzpicture}
\end{esempiopgf}
\endgroup
`

Mi stavo dimenticando: controlla che funzioni senza plot (io non ci ho mai provato). Se si lamenta e vuole come minimo un [tt]\addplot[/tt] per compilare, ma tu non vuoi mostrare la forma d’onda, usa la chiave [tt]forget plot[/tt].

Due castronerie. La prima: [tt]axis[/tt] funziona anche senza plot. La seconda: [tt]forget plot[/tt] leva il plot dalla legenda (pro memoria: consulare il manuale e non andare a memoria 😀 ).

Ciao
Claudio

illinguista1972″ post=84485Grazie 🙂
Ma c’è modo di dare questa chiave una volta per tutte? Serve solo a noi per la guida, non vorremmo farla vedere come opzione. L’ho levata da lì, l’ho messa tra le impostazioni di pgfplots, ma ottengo l’errore di prima 🙁

Ciao
Tommaso

Certo: `
\tikzset{trim axis left}
` perché [tt]\tikzset[/tt] imposta come path [tt]/tikz/[/tt] che è proprio quello in cui si trova quella chiave. Essendo piazzata sotto [tt]/tikz/[/tt] non c’è verso di farla funzionare con [tt]\pgfplotsset[/tt].

Se vuoi averla come opzione globale ti conviene metterla nel preambolo.

Ciao
Claudio

Ok: sciocchezza n.3 della serata. 🙁 In effetti però una piccola tirata d’orecchi va pure a Tommaso 😉

Leggendo la documentazione, quello che ho proposto prima non va chiaramente bene. Infatti, alla voce [tt]trim axis left[/tt] c’è scritto:

A style with value trim left=(current axis.south west).
The style needs to be provided as argument to \begin{tikzpicture}[trim axis left]. It ex-
pects (at least) one pgfplots environment in the picture. The effect is to trim everything which
is left of the last axis’ anchor south west (i.e. everything left of the left axis boundary).

In parole povere si può usare solo come argomento di [tt]tikzpicture[/tt] perché la chiave cerca l’ambiente [tt]axis[/tt] di pgfplots. E non c’è nemmeno verso di fare i furbi e provare cose come:`
\tikzset{execute at begin picture={trim axis left}}
` oppure:`
\tikzset{every picture/.style={trim axis left}}
` Infatti, l’opzione deve proprio essere locale e, nota che se l’ambiente [tt]tikzpicture[/tt] non ha un’ambiente [tt]axis[/tt] riceverai di nuovo l’errore:`! Package pgf Error: No shape named current axis is known.` perché il valore di trim dato dalla coordinata [tt]current axis.south west[/tt] ha senso solo quando [tt]current axis[/tt] viene definito.

Come work around, puoi sempre dire nella guida a cosa serve l’opzione [tt]trim axis left[/tt]: non è bello, ma i lettori capiranno. Un secondo workaround, altrettanto non elegante, è quello di impostare in valore assoluto [tt]trim left[/tt] con: `\tikzset{trim left=0.5cm}` (codice che questa volta ho provato 😉 ).

Ciao
Claudio