Luigi
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 Apr11 awarded Yearling Jan28 accepted TikZ, passing two values as an ordered pair Jan28 comment TikZ, passing two values as an ordered pair @MarkWibrow, this is exactly what I was looking for. Please write down your answer. Jan28 comment TikZ, passing two values as an ordered pair Because the value is an ordered couple of values, not just a single value and I want to work with the two values separately elsewhere. Jan28 asked TikZ, passing two values as an ordered pair Jan22 revised About the actual meaning of \pgfplotsunitxlength macro from the pgfplots package added 7 characters in body Jan22 revised About the actual meaning of \pgfplotsunitxlength macro from the pgfplots package added 862 characters in body Jan22 comment About the actual meaning of \pgfplotsunitxlength macro from the pgfplots package I've added a new post in the bug section. I'm copying its content at the bottom of the question to let the other users to contribute the discussion. Jan17 comment pgfplots, TikZ interoperability and axis equal If it can be helpful, I've added a further example in the pgf language in which I've set no local coordinate system and I've used 3D coordinates instead of a 2D ones. Jan17 revised pgfplots, TikZ interoperability and axis equal I've added a further example Jan17 asked pgfplots, TikZ interoperability and axis equal Jan7 accepted Prevent expression evaluation for some values in TikZ Jan7 comment Prevent expression evaluation for some values in TikZ @jfbu, I'm sorry: I mistook the order of the two expressions. Your answer works good too. Jan7 comment Prevent expression evaluation for some values in TikZ No. It isn't a dimension too large error but a division by zero error that is just what I wanted to avoid when I asked to prevent the function from being evaluated in x=0. If I use the @Kpym code substituting the < sign with the = one, it still works good. Jan7 comment Prevent expression evaluation for some values in TikZ I'm trying to modify your function to work with an equal sign but it fails in x=0 like in the question. Is there any way to let it work with the equal sign? Jan7 awarded Notable Question Jan6 asked Prevent expression evaluation for some values in TikZ Dec5 comment Looking for a certain math symbol I upvoted your answer. Even better to use the `\ang` command from the siunitx package. Dec5 comment TikZ: Parametric Gnuplot plot fails to appear As Joseph stated, the "original sin" (in the true sense of the word) is in the OPs code. I looked to the picture and didn't realize that the error was in the question. Dec5 comment TikZ: Parametric Gnuplot plot fails to appear You are absolutely right. I started from the picture...