Where can I find more information on the fp package? I have been to ctan and the author even has better documentation as a todo.


The reason I ask is because sometimes when I use fixed point arithmetic in some TikZ pictures I receive errors but other times it works just fine. Therefore, I want to identify why it wont work in some instances.

  • Do you have a particular reason for using the fp package instead of the fpu library that ships with PGF?
    – Jake
    Commented Jul 6, 2013 at 15:44
  • @Jake I was using fp for accuracy when using decimals in calculations. Is fpu a similar library?
    – dustin
    Commented Jul 6, 2013 at 15:46
  • Yes, exactly. It's what's used by PGFPlots in the background, for example. It's documented in the PGF manual.
    – Jake
    Commented Jul 6, 2013 at 15:48
  • @Jake so \usepackage{fpu} or \usetikzlibrary{fpu} then does anything needed to be said in the tikz environment?
    – dustin
    Commented Jul 6, 2013 at 15:51
  • \usetikzlibrary{fpu}, and then \pgfkeys{/pgf/fpu=true} ... <your calculation> ... \pgfkeys{/pgf/fpu=false}. The details depend on what you're trying to do.
    – Jake
    Commented Jul 6, 2013 at 15:54

1 Answer 1


Taking the fp part of the question (the TikZ part is quite different), the short answer is 'there is none'. The fp package has been on CTAN for many years without any changes, and the only documentation it provides is as comments in the various .tex files. These are terse but at least tell us what functions are available.

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