# Can't use 'equal' in tikz-cd [closed]

Ok, here is the problem. I'm trying to draw some commutative diagram in LaTeX that involve some "equal" sign in tikz-cd:

$\begin{tikzcd} 0 \arrow{r} & X \ar[equal]{d}\\ 0 \arrow{r} & X \end{tikzcd}$


(\usepackage{tikz-cd} is already included in the preamble)

I get the diagram but the equal signs appear as simple arrows. In Kile I get no errors but in TeXMaker the following error appears:

! Package pgfkeys Error: I do not know the key '/tikz/equal' and I am going to ignore it. Perhaps you misspelled it.

By reading some other threads I got the impression that this is "pgf" related problem. I have several TeX related folder in my /usr/share:

texinfo, texmaker, texmf, texmf-dist, texmf-local

it seems that pgf files are inside texmf-dist:

/usr/share/texmf-dist/tex/generic/pgf

I think that TeXMaker is using this folder too, based on the content of TeXMaker log file: http://www.ipaste.eu/view.php?id=4065

So what's wrong with the pgf that can't render the "equal sign"?

## closed as off-topic by Joseph Wright♦Aug 22 '13 at 8:13

• This question does not fall within the scope of TeX, LaTeX or related typesetting systems as defined in the help center.
If this question can be reworded to fit the rules in the help center, please edit the question.

• Take a look at an answer of mine where I have used the equal arrow, which should render as a line, not an arrow tip. From the log file, I can see that you use an old version of tikz-cd (2012/03/18 v0.2b). My current version is 2012/12/30 v0.3c. – Qrrbrbirlbel Jul 1 '13 at 19:23
• Welcome to TeX.SX! You can have a look at our starter guide to familiarize yourself further with our format. – karlkoeller Jul 1 '13 at 19:31
• @ Qrrbrbirlbel, I still get arrows using your code in that answer. I reckon it's because of the old version. How can I upgrade the current version? Shall I remove the current version first? I've read the {pgfmanual.pdf} and it says just extract the files you download in texmf/tex/generic/pgf and issue texhash. My current pgf folder is in texmf-dist shall I just install the new version in texmf fodler? – James Jul 1 '13 at 19:48
• I first removed /usr/share/texmf-dist/tex/generic/pgf directory then copying pgf files downloaded from sourceforge and extracting them in the newly created /usr/share/texmf-dist/tex/generic/pgf and then issued the command texhash. the problem still persists. Shall I not compile the pgf package first? does texhash automatically do that (apparently it doesn't)? Please help, I'm already under pressure to finish the paper. – James Jul 1 '13 at 20:46
• There is no need to update packages yourself, manually or by removing old files first. Simply use the updating manager from your distribution. Take a look at How do I update my TeX distribution? – Qrrbrbirlbel Jul 2 '13 at 3:18