# A problem with the command \nccurve

\documentclass[12pt,a4paper]{article}
\usepackage{amsmath,amssymb}
\usepackage[utf8]{vietnam}
\usepackage{pstricks,pst-node} % required package
\usepackage{auto-pst-pdf}
\begin{document}
\begin{pspicture}
[name=2] 2 &  & [name=3] 3 \\
&[name=5] 5 \\
[name=1] 1 &  & [name=4] 4
\psset{linecolor=blue,arrowscale=1.5}

\ncline{->}{3}{2}
\ncline{->}{4}{3}
\ncline{->}{4}{5}
\ncline{->}{5}{3}
\ncline{->}{5}{1}
\ncline{->}{1}{4}

\nccurve[angleA=80,angleB=25,ncurv=5]{->}{3}{3}

\ncarc[arcangle=22]{->}{1}{2}
\ncarc[arcangle=22]{->}{2}{1}
\endpsmatrix

\end{pspicture}
\end{document}


How to draw Picture 1 like as Picture 2?(I see, 2 is more beautiful than 1)

How to compact \ncline or we can only typing manually? It means is there a macro like as \ncline{->}{3}{2}{->}{4}{3}{->}{4}{5}... ?

Picture 1:

Picture 2:

The code of Picture 2 ( use tikz )

\documentclass[tikz,border=3mm]{standalone}
\begin{document}
\begin{tikzpicture}
[every node/.style={circle,draw=red},
every path/.style={blue,-latex,thick}]
\def\a{2}
\node (5) at (0,0) {$5$};
\node (1) at (-\a,-\a) {$1$};
\node (2) at (-\a,\a) {$2$};
\node (3) at (\a,\a) {$3$};
\node (4) at (\a,-\a) {$4$};
\draw (1)--(4); \draw (4)--(3);
\draw (3)--(2); \draw (5)--(3);
\draw (5)--(1); \draw (4)--(5);
\draw (2) to[out=-70,in=70] (1);
\draw (1) to[out=110,in=-110] (2);
\draw (3) .. controls +(80:1) and +(30:1) .. (3); % <<<---- notice!
\end{tikzpicture}
\end{document}

• Please improve question title. – albert Nov 29 '18 at 12:02
• :))))))))))))))))))))))))))) – Trong Vuong Nov 29 '18 at 12:10
• I assume you mean here that picture 2 (though hard to see that it are 2 pictures as they are in the output very close to one another) is nicer, in your eyse, than picture 1. In what respect ? What is the difference in the generation of picture 1 and picture 2? – albert Nov 29 '18 at 12:23
• I don't know the difference in the generation between them. :-)). I only hope anyone improve its macro "\nccurve[angleA=80,angleB=25,ncurv=5]{->}{3}{3}". ;)) – Trong Vuong Nov 29 '18 at 12:32
• Can you change the title to reflect which problem you have? At the moment it won't help any future users who might have the same problem as you – user36296 Nov 29 '18 at 12:37

define your own macro and for the loop use symmetrical angles with respect to 45 degrees::

\documentclass{article}
\usepackage{pst-node} % required package
\usepackage{auto-pst-pdf}

\makeatletter
\newcommand\NCline[3]{\ncline{#1}{#2}{#3}\@ifnextchar\bgroup\NCline{}}
\makeatother
\begin{document}
[name=2] 2 &            & [name=3] 3 \\
&[name=5] 5 \\
[name=1] 1 &            & [name=4] 4
\psset{linecolor=blue,arrowscale=1.5}
\NCline{->}{3}{2}{->}{4}{3}{->}{4}{5}{->}{5}{3}{->}{5}{1}{->}{1}{4}
\nccurve[angleA=75,angleB=15,ncurv=6]{->}{3}{3}

\ncarc[arcangle=22]{->}{1}{2}
\ncarc[arcangle=22]{->}{2}{1}
\endpsmatrix

\end{document}


• What do you think about its the tikz code?. ( I see its code "shorter" but "complete" :-(( .The pstricks code is longer, more complex than or the reason my code is not enough short as it ). See my editted comment – Trong Vuong Nov 29 '18 at 13:14
• sure, it has absolute coordinates for the nodes! Can also be done with PSTricks. – user2478 Nov 29 '18 at 13:18