TikZ et utilisation d'une variable dans foreach

J'ai besoin de faire varier l'ensemble dans lequel la variable de la boucle foreach prend ses valeurs (dans TikZ).

Je m'explique : l'exemple suivant marche (ma variable est \n) :

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\documentclass{article}
\usepackage{tikz}
\newcommand{\n}{3}
\begin{document}
\begin{tikzpicture}
\foreach \i in {0,...,\n} \draw (\i,0) circle (0.5);
\end{tikzpicture}
\end{document}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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tandis que si je remplace le \n par \n-1 dans le foreach comme dans l'exemple suivant, ça ne fonctionne plus :

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\documentclass{article}
\usepackage{tikz}
\newcommand{\n}{3}
\begin{document}
\begin{tikzpicture}
\foreach \i in {0,...,\n-1} \draw (\i,0) circle (0.5);
\end{tikzpicture}
\end{document}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Commment résoudre ce problème ?

tikz foreach

Posée 19 Mar '21, 16:29

Mario
195●3●11
Taux d'acceptation : 100%

Est-ce que tu peux compter de 1 à \n et utiliser ensuite \i-1?

(22 Mar '21, 15:33) zkpr9IRn5CrI

3 réponses :

En cours Anciennes Récentes Populaires

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\documentclass{article}
\usepackage{tikz}
\newcommand{\n}{3}
\begin{document}
\begin{tikzpicture}
\pgfmathparse{\n-1}
\foreach \i in {0,...,\pgfmathresult}{ 
  \draw (\i,0) circle (0.5);
}
\end{tikzpicture}
\end{document}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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alt text

Lien permanent

Publiée 19 Mar '21, 16:57

samcarter
8.5k●2●8●17
Taux d'acceptation : 57%

Modifiée 19 Mar '21, 16:58

\foreach propose l'option parse pour répondre précisément à ce besoin.

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\documentclass{article}
\usepackage{tikz}
\newcommand{\n}{3}
\begin{document}
\begin{tikzpicture}
\foreach[parse=true] \i in {0,...,\n-1} \draw (\i,0) circle (0.5);
\end{tikzpicture}
\end{document}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Lien permanent

Publiée 15 Avr '21, 23:09

Paul Gaborit
2.0k●1●6
Taux d'acceptation : 30%

Modifiée 15 Avr '21, 23:12

Voici d'autres possibilités :

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\documentclass{article}
\usepackage{tikz}
\newcommand{\n}{3}
\begin{document}
\begin{tikzpicture}
\foreach \i in {0,...,\numexpr\n-1} \draw (\i,0) circle (0.5);
\end{tikzpicture}
\end{document}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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\documentclass{article}
\usepackage{tikz}
\newcommand{\n}{3}
\begin{document}
\begin{tikzpicture}
\foreach \i in {0,...,\n} {\ifnum\i<\n \draw (\i,0) circle (0.5);\fi}
\end{tikzpicture}
\end{document}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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ou encore,

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\documentclass{article}
\usepackage{tikz}
\newcommand{\n}{3}
\begin{document}
\begin{tikzpicture}
\foreach \i in {0,...,\n} \draw ({sign(\n-\i)*\i},0) circle (0.5);
\end{tikzpicture}
\end{document}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Lien permanent

Publiée 24 Mar '21, 19:24

touhami
9.8k●4●10
Taux d'acceptation : 51%

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Mots-clés de la question :

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Question posée : 19 Mar '21, 16:29

Question vue : 7,825 fois

Dernière mise à jour : 15 Avr '21, 23:12

TikZ et utilisation d'une variable dans foreach

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