Adicionando o tick do machado, mas não o tick do y correspondente

Question

Estou gerando pgfgráficos dinamicamente e gostaria de evitar adicionar números não inteiros y ticksaos meus gráficos, mantendo todos os arquivos x ticks. Aqui está um MWE:

\documentclass[10pt]{article}
\usepackage{tikz}
\usepackage{amsmath}
\usepackage{siunitx}
\usepackage{amssymb}
\usepackage{pgfplotstable}
\usepackage[active, pdftex, tightpage]{preview}
\PreviewEnvironment[{[]}]{tikzpicture}
\setlength\PreviewBorder{2mm}
\begin{filecontents}{PJxpGrZtwos.tex.dat}
N      f             M
1024   3.407938e+01  25
1536   1.339487e+01  20
2048   1.139487e+01  19
3072   8.351236e+00  14
4049   6.466788e+00  13
6144   4.466788e+00  11
\end{filecontents}
\pgfkeys{/pgf/fpu=true}
\pgfplotstableread{PJxpGrZtwos.tex.dat}\loadedtable
\pgfplotstablegetelem{0}{N}\of{\loadedtable}
\let\relativeTo\pgfplotsretval
\pgfplotstablegetelem{0}{f}\of{\loadedtable}
\let\f\pgfplotsretval
\pgfplotstablecreatecol[create col/expr={\f / \thisrow{f}}]{f-relative}\loadedtable
\pgfkeys{/pgf/fpu=false}

\begin{document}
\begin{tikzpicture}
    \begin{loglogaxis}[axis y line*=left, legend pos=south east,xlabel={N},xtick=data, xticklabels from table={\loadedtable}{N},ytick=data, yticklabel=\pgfmathparse{exp(\tick)}\pgfmathprintnumber{\pgfmathresult}, ylabel ={$\dfrac{f(\pgfmathprintnumber\relativeTo)}{f(N)}$}]
\addplot[black] table[x=N, y expr=\thisrow{N}/\relativeTo] {\loadedtable};
\addplot[blue, mark=*] table[x=N, y=f-relative] {\loadedtable};
\legend{{Linear progression},}
\end{loglogaxis}
\begin{semilogxaxis}[ymin = 5, ytick={10, 15, ..., 30}, ymax = 35, axis x line=none,ylabel={\# M}, axis x line=none, axis y line*=right, ylabel near ticks=right, yticklabel pos=right]
\addplot[red, dotted, mark=x, mark options={solid}] table[x=N, y=M] {\loadedtable};
\end{semilogxaxis}
\end{tikzpicture}
\end{document}

O que eu gostaria aqui é \addplot[black] table[x=N, y expr=\thisrow{N}/\relativeTo] {\loadedtable};não adicionar y ticksvalores não inteiros \thisrow{N}/\relativeToenquanto mantém all x ticks.

Se você tiver alguma outra maneira de desenhar uma função linear de (x_min, 1) para (x_max, x_max/x_min), tendo o bom correspondente y ticks(talvez criando outra tabela?), Isso também resolverá o problema.

Lembre-se de que isso é para geração de plotagem 'on the fly', não sei meu valor a priori, então não posso usar neste caso y tick={1,...,6}.

Answer 1

Você pode introduzir alguma tolerância para os rótulos de ticks por meio de algumas condições if.

\documentclass{standalone}
\usepackage{amsmath,amssymb,siunitx}
\usepackage{pgfplotstable}
\begin{filecontents}{PJxpGrZtwos.tex.dat}
N      f             M
1024   3.407938e+01  25
1536   1.339487e+01  20
2048   1.139487e+01  19
3072   8.351236e+00  14
4049   6.466788e+00  13
6144   4.466788e+00  11
\end{filecontents}
\pgfkeys{/pgf/fpu=true}
\pgfplotstableread{PJxpGrZtwos.tex.dat}\loadedtable
\pgfplotstablegetelem{0}{N}\of{\loadedtable}
\let\relativeTo\pgfplotsretval
\pgfplotstablegetelem{0}{f}\of{\loadedtable}
\let\f\pgfplotsretval
\pgfplotstablecreatecol[create col/expr={\f / \thisrow{f}}]{f-relative}\loadedtable
\pgfkeys{/pgf/fpu=false}

\begin{document}
\begin{tikzpicture}
\begin{loglogaxis}[
axis y line*=left, 
legend pos=south east,
xlabel={N},
xtick=data, 
xticklabels from table={\loadedtable}{N},
ytick=data, 
yticklabel={
\pgfmathparse{abs(exp(\tick) - int(exp(\tick)))}
\ifdim\pgfmathresult pt>0.999 pt
    \pgfmathparse{exp(\tick)}
    \pgfmathprintnumber{\pgfmathresult}
\else
    \ifdim\pgfmathresult pt<0.01 pt
    \pgfmathparse{exp(\tick)}
    \pgfmathprintnumber{\pgfmathresult}
    \else{}
    \fi
\fi
}, 
ylabel ={$\dfrac{f(\pgfmathprintnumber\relativeTo)}{f(N)}$}]

\addplot[black] table[x=N, y expr=\thisrow{N}/\relativeTo] {\loadedtable};
\addplot[blue, mark=*] table[x=N, y=f-relative] {\loadedtable};
\legend{{Linear progression},}
\end{loglogaxis}
\begin{semilogxaxis}[ymin = 5, ytick={10, 15, ..., 30}, ymax = 35, axis x line=none,ylabel={\# M}, axis x line=none, axis y line*=right, ylabel near ticks=right, yticklabel pos=right]
\addplot[red, dotted, mark=x, mark options={solid}] table[x=N, y=M] {\loadedtable};
\end{semilogxaxis}
\end{tikzpicture}
\end{document}

Answer 2

A solução óbvia acordou para mim. Basta excluir a parte "ytick=data". Eu entendi mal alguma coisa?

\documentclass[10pt]{article}
\usepackage{tikz}
\usepackage{pgfplotstable}
\usepackage[active, pdftex, tightpage]{preview}
\PreviewEnvironment[{[]}]{tikzpicture}
\setlength\PreviewBorder{2mm}
\begin{filecontents}{Dkb0rjC9L.tex.dat}
x y
1 1
2 1.5
3 2
4 3
5 4
\end{filecontents}
\begin{document}
\begin{tikzpicture}
\begin{axis}[xtick=data]
\addplot table {Dkb0rjC9L.tex.dat};
\end{axis}
\end{tikzpicture}
\end{document}