Why can't I draw lines between tikz nodes generated by loops with multiple variables?
I have a bunch of nodes, some of which I want to connect with a sequence of arrows. The notes are numbered, and I've tried to store some more data as well; in my minimal example below I've stored coordinates.
I found a way to create the notes. My problem is that I can't seem to use them to draw. The following example compiles:
\begin{tikzpicture}
\foreach \k in {0,1,2}
\node (\k) at (\k,\k*\k-2*\k) {\k};
\def\Data{
3 / 2 / 1,
4 / 1 / 2,
5 / 2 / 3}
\foreach \a / \x / \y in \Data
\node (\a) at (\x,\y) {\a};
\draw (0) -- (2);
%\draw (3) -- (4);
\foreach \note [remember=\note as \lastnote (initially {(0)})] in {(1),(2)} \draw[->] \lastnote -- \note;
% \foreach \note [remember=\note as \lastnote (initially {(3)})] in {(4),(5)} \draw[->] \lastnote -- \note;
\end{tikzpicture}
If I uncomment any of the two commented lines, I get an error message that "Package pgf Error: No shape named 3 is known."
How are the nodes 0, 1, 2 different from the nodes 3, 4, 5? Why can't I draw with the latter?