using more than 2 arguments in a pgfplots style

Question

Based on How to plot data from multiple filters using pgfplots I got a follow up one. I would like to filter not only for one value of P for each plot but for also for X values that are smaller than a given value. Here is how I tried to achieve it.

  \pgfplotsset{
    discard if not and smaller/.style 4 args={
        x filter/.code={
            \edef\tempa{\thisrow{#1}}
            \edef\tempb{#2}
            \edef\tempc{\thisrow{#3}}
            \edef\tempd{#4}
            \ifnum\tempa=\tempb
                \ifnum\tempc<\tempd
                    \def\pgfmathresult{inf}
                \else
                \fi
            \else
                \def\pgfmathresult{inf}
            \fi
        }
    }
    }

    \begin{tikzpicture}
    \begin{axis}
    \addplot [ultra thick, black, discard if not and smaller={P}{0}{X}{5}] table [x=X, y=Y] {data.dat};
    \end{tikzpicture}

But pdfLaTeX tells me that:

! Package pgfkeys Error: I do not know the key '/pgfplots/discard if not and sm
aller/.style 4 args' and I am going to ignore it. Perhaps you misspelled it.

How can I pass these 4 arguments so that pgfplots find the style definition?

Hi soriak. Usually, we don't put a greeting or a "thank you" in our posts. While this might seem strange at first, it is not a sign of lack of politeness, but rather part of our trying to keep everything very concise. Accepting and upvoting answers is the preferred way here to say "thank you" to users who helped you. — Claudio Fiandrino, Mar 31 '13 at 07:47

score 11 · Accepted Answer · answered Mar 31 '13 at 08:11

More than two arguments require /.style n args={no of args}{....} or /.code n args={no of arguments}{....}

  \pgfplotsset{
    discard if not and smaller/.style n args={4}{
        x filter/.code={
            \edef\tempa{\thisrow{#1}}
            \edef\tempb{#2}
            \edef\tempc{\thisrow{#3}}
            \edef\tempd{#4}
            \ifnum\tempa=\tempb
                \ifnum\tempc<\tempd
                    \def\pgfmathresult{inf}
                \else
                \fi
            \else
                \def\pgfmathresult{inf}
            \fi
        }
    }
    }

    \begin{tikzpicture}
    \begin{axis}
    \addplot [ultra thick, 
              black, 
              discard if not and smaller={P}{0}{X}{5}] table [x=X, y=Y] {data.dat};
    \end{tikzpicture}

If you have a certain pattern when entering these arguments instead of consecutive braces {1}{2}{3}{4} etc. you can also use

/.style args={#1 and #2 using color #3 and size #4}

or anything else so that you can supply arguments

mykey=a and b using color white and size 2cm

Same holds for /.code args too.

Could you make yoúr MWE runable? – cis Jan 30 '20 at 18:53 — cis, Jan 30 '20 at 18:53

using more than 2 arguments in a pgfplots style

1 Answers1

Linked