How can I use arithmetic inside a node's curly brackets? I have this, and it prints for example "0+1" in a circle. I would like to have circles that show the sum of their coordinates.


\foreach \x in {0,1,2,3}
\foreach \y in {0,1,2,3}
\draw [] (\x,\y) circle [radius=0.4] node {\x + \y};

  • 1
    Chapter VIII of the Tikz manual is devoted to the mathematical engine... You should find there all you need. Basically, look for pgfmathparse, pgfmathresult and company. – Rmano Jun 10 '18 at 21:08

In this simple case where only integers are involved you can do the arithmetic using \numexpr.




\foreach \x in {0,1,2,3}
\foreach \y in {0,1,2,3}
\draw [] (\x,\y) circle [radius=0.4] node {\the\numexpr\x + \y\relax};


which gives

enter image description here

But there must be some TikZ way.

Note: \numexpr is available since 2004 by default with pdflatex with TeXLive distribution. But there is not much of user level documentation I think.

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