Re: [LaTeX][PGF/TikZ] Undefined control sequence error for PGF intersections.

Annada Behera <segfault@tilde.green> wrote or quoted:

% Mark intersection points and draw dashed lines
\foreach \n in {1,...,\t} {

. . .

What is undefined?

  Looks like "\t" is on the fritz or not pulling its weight,
  since the loop seems to be cruising when we swap "\t" for "4":

\foreach \n in {1,...,4} {

  . That error message was probably about as clear as LA smog.