TikZ is a higher-level drawing language built on top of the PGF graphics framework. For questions specifically about the PGF layer use {pgf-core} instead. Both tags are possible on the same question. The tag {diagrams} is also compatible with this tag.

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Putting coordinate axes on a TikZ picture

I get the following error: Package pgf Error: No shape named Q is known. Without the \begin{axis} ... \end{axis}, the code is compiled but the images depicted is a jumbled mess. I intended to get a ...