Suppose that I define two points a and b in a TikZ picture, such as:
\coordinate (a) at (.8,0);
\coordinate (b) at (0,1.25);
And now suppose that I want to define a third point c whose first coordinate is the first coordinate of point a and whose second coordinate is the second coordinate of point b. Can it be done? And, if so, how?
\coordinate (c) at (a|-b);or, as @Schrödinger's cat suggested,\path (a|-b) coordinate (c);. – LaTeXer Oct 28 '19 at 20:11