pgfplots: Log-Log Graph Missing Grid Lines

Question

I am attempting to plot a log-log graph with bounds not falling on a factor of 10. In my case, the y-axis goes from ymin=0.3 to ymax=300. As you can see in the screenshot, the minor grid lines for y=100 and 200 are missing. Interestingly, if I set ymax=400, the problem goes away.

Per this question, I know I can manually add grid lines with minor tick={100,200,etc} in the axis options, but this not ideal since the bounds of the graph may need to change, and re-updating the tick list is annoying.

My MWE is below.

\documentclass[letter,landscape]{article}

\usepackage{pgfplots}
\pgfplotsset{compat=1.16}

\begin{document}

\begin{tikzpicture}
    \begin{loglogaxis}[
        %
        width=5in, height=4in,
        xmin=0.01, xmax=100,
        domain=0.01:100, 
        log ticks with fixed point,
        extra x ticks ={0.02,0.04,0.06,0.08,0.2,0.4,0.6,0.8,2,4,6,8,20,40,60,80},
        extra x tick labels ={0.02,0.04,0.06,0.08,0.2,0.4,0.6,0.8,2,4,6,8,20,40,60,80},
        x tick label style={rotate=90},
        ymin=0.3, ymax=300,
        log ticks with fixed point,
        extra y ticks ={0.3,0.4,0.6,0.8,2,4,6,8,20,40,60,80,200,300},
        extra y tick labels ={0.3,0.4,0.6,0.8,2,4,6,8,20,40,60,80,200,300},
        grid=minor,
        ]
    \end{loglogaxis}
\end{tikzpicture}

\end{document}

Answer 1

It is imho by design: pgfplots avoids to draw minor ticks at the borders and with your values this part is missing. You can force it to add ticks by enlarging the value, but probably it will break other plots, so it should be done locally:

\documentclass[letter,landscape]{article}

\usepackage{pgfplots}
\pgfplotsset{compat=1.16}
\usepackage{etoolbox}
\begin{document}
\begin{tikzpicture}
\makeatletter
\patchcmd\pgfplots@prepare@tick@coordlists@for {\pgfplots@ticknum=\c@pgfplots@ticknum@last}
 {\pgfplots@ticknum=\numexpr\c@pgfplots@ticknum@last+1}{}{\fail}
\makeatother
    \begin{loglogaxis}[
        %
        width=5in, height=4in,
        xmin=0.01, xmax=100,
        domain=0.01:100,
        log ticks with fixed point,
        extra x ticks ={0.02,0.04,0.06,0.08,0.2,0.4,0.6,0.8,2,4,6,8,20,40,60,80},
        extra x tick labels ={0.02,0.04,0.06,0.08,0.2,0.4,0.6,0.8,2,4,6,8,20,40,60,80},
        x tick label style={rotate=90},
        ymin=0.3, ymax=300,
        log ticks with fixed point,
        extra y ticks ={0.3,0.4,0.6,0.8,2,4,6,8,20,40,60,80,200,300},
        extra y tick labels ={0.3,0.4,0.6,0.8,2,4,6,8,20,40,60,80,200,300},
        grid=minor,
        ]
    \end{loglogaxis}
\end{tikzpicture}

\end{document}