2

In a tikzcd diagram, even if I put the condition "no head", I see the tip in the pdf after compilation in the vertical and horizontal arrows. However, I don't see this problem in diagonal arrows.

Question: How do I get rid of the arrow tips?

Sample code:

\documentclass[a4paper]{article}

\usepackage{amsmath, amssymb}
\usepackage{tikz-cd}


\author{Work}
\title{}
\begin{document}
\maketitle
        [
        \begin{tikzcd}
a \arrow[r, no head, Rightarrow] \arrow[rd, no head, Rightarrow] & a \arrow[d, no head, Rightarrow] \
                                                                 & a

\end{tikzcd}
        .]
\end{document}

On compilation, I get the following diagram:

enter image description here

Spai
  • 123

2 Answers2

5

With Rightarrow you overwrite no head, i.e. important is sequence of options. In the following MWE you can see three options, how to draw your arrows without of heads:

\documentclass[a4paper]{article}
\usepackage{tikz-cd}

\author{Work}
\title{}
\begin{document}
\maketitle
    [
\begin{tikzcd}
a \ar[r, equal]   % gives the same as "Rightarrow, no head"
  \ar[rd, Rightarrow, no head]   % nohead prevail 
        & a \ar[d, no head, Rightarrow] \  % \Rightarrow prevail
        & a
\end{tikzcd}
    .]
\end{document}

enter image description here

As you can see, you can achieve desired lines style with single option equal.

Zarko
  • 296,517
2

The @Zarko's answer is perfect! I use (off-topic) with the tag, xy package that have also the same tips of tikz-cd. The syntax is criptic, sincerely, but it is not very hard to understand. I'm using xy because it has not yet corrected the bug of the vertical line (at the begin and at the end of no head option).

\documentclass[a4paper,12pt]{article}
\usepackage[all,cmtip]{xy}
\begin{document}
\[\xymatrix@R=2pc@C=3pc{
a  \ar@{=}[dr]\ar@{=}[r]& a\ar@{=>}[d]^{\quad.} \\
&  a 
}\]
\end{document}

enter image description here

The code @R=2pc@C=3pc adjust the size of the R=rows and of the C=columns in function of your tastes.

Sebastiano
  • 54,118
  • 1
    +1! ones I will o learn a little bit more about xy package :-) – Zarko Nov 02 '20 at 15:53
  • @Zarko ahaahahah LOL :-)..Thank you very much. The code of xy package it is not very simple, almost for me that I have difficulties to understand the commands. But I have not understood the reason of the actual bug in the tikz-cd when you use the option no head, and because it is not has removed. – Sebastiano Nov 02 '20 at 15:56