I would like to place a circle between two node, something like:

\node [sum, pos=($(sys1.east)!0.5!(sys2.west)$)](sum1) {};

How can I do that?

  • \node[sum] (sum) at ($(sys1)!0.5!(sys2)$)) {}; – user11232 Sep 17 '15 at 10:07
    \node (sys1) {sys1};
    \node[right=3cm of sys1] (sys2) {sys2};
    \node[draw,circle,inner sep=2pt] (sum) at ($(sys1)!0.5!(sys2)$) {};
    %\path (sys1) -- node[midway,draw,circle,inner sep=2pt] {} (sys2);
    %\draw ($(sys1)!0.5!(sys2)$) circle (2pt);

enter image description here

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