Krdytkyu

I am trying to draw gridlines inside a square. Here is my code:

documentclass{article}

usepackage{pgfplots}

pgfplotsset{compat=1.15}



begin{document}



begin{figure}[ht]



centering



begin{tikzpicture}[scale=1.25,line width=1pt]

begin{axis}[

color= white,

xmin=-28.9, 

xmax=28.9, 

ymin=-28.9, 

ymax=28.9, 

axis equal image, 

axis lines=middle,

]



foreach x in {-24,..., 24}

    {draw[thin, gray] (x,-24) -- (x,24);}



draw[black, thin] (-24,-24) -- (-24,24) -- (24,24) -- (24, -24) -- 

(-24,-24);



node[black, below] at (24,-24) {$(1,0)$};



node[black, below] at (-24,-24) {$(0,0)$};



node[black, above] at (-24,24) {$(0,1)$};



node[black, above] at (24,24) {$(1,1)$};



end{axis}

end{tikzpicture}



end{figure}



end{document}

This code, however, will not compile. My goal is to make a square with a 24 x 24 grid.

Works fine if you use pgfplotsinvokeforeach instead of foreach:

Notes:

• I would suggest you try the grid options built into pgfplots and tikz.


• All the code you showing does not require pgfplots so you can eliminate the axis environment. So, unless there is other functionality that is not shown in the MWE, you should consider the non-axis environment version which uses foreach.

References:

• foreach not behaving in axis environment


• 
  Tikz foreach loop and coordinate computation.

Code: pgfplots

documentclass{article}

usepackage{pgfplots}

pgfplotsset{compat=1.15}



begin{document}

%

%begin{figure}[ht]

%

%centering

%

begin{tikzpicture}%[scale=1.25,line width=1pt]

begin{axis}[

    color= white,

    xmin=-28.9, 

    xmax=28.9, 

    ymin=-28.9, 

    ymax=28.9, 

    axis equal image, 

    axis lines=middle,

]



pgfplotsinvokeforeach {-24,...,24} {%

    draw[thin, gray] (#1,-24) -- (#1,24);

}



draw[black, thin] (-24,-24) -- (-24,24) -- (24,24) -- (24, -24) -- 

(-24,-24);



node[black, below] at (24,-24) {$(1,0)$};



node[black, below] at (-24,-24) {$(0,0)$};



node[black, above] at (-24,24) {$(0,1)$};



node[black, above] at (24,24) {$(1,1)$};



end{axis}

end{tikzpicture}%

%

%end{figure}

%

end{document}

Code: no pgfplots

documentclass{article}

usepackage{pgfplots}

pgfplotsset{compat=1.15}



begin{document}

begin{tikzpicture}[scale=0.10]



foreach x in  {-24,...,24} {%

    draw[thin, gray] (x,-24) -- (x,24);

}



draw[black, thin] (-24,-24) -- (-24,24) -- (24,24) -- (24, -24) -- 

(-24,-24);



node[black, below] at (24,-24) {$(1,0)$};



node[black, below] at (-24,-24) {$(0,0)$};



node[black, above] at (-24,24) {$(0,1)$};



node[black, above] at (24,24) {$(1,1)$};



end{tikzpicture}%

end{document}

Two other options without pgfplots, one without foreach and one with foreach:

documentclass[tikz,border=2mm]{standalone} 

usetikzlibrary{positioning}



begin{document}

begin{tikzpicture}

draw (0,0) grid (24,24);

node[above right] at (24,24) {$(1,1)$};

node[above left] at (0,24) {$(0,1)$};

node[below left] at (0,0) {$(0,0)$};

node[below right] at (24,0) {$(1,0)$};

end{tikzpicture}



begin{tikzpicture}

foreach i in {0,...,24}{

    draw (i,0) -- ++(90:24);

    draw (0,i) -- ++(0:24);

}

node[above right] at (24,24) {$(1,1)$};

node[above left] at (0,24) {$(0,1)$};

node[below left] at (0,0) {$(0,0)$};

node[below right] at (24,0) {$(1,0)$};

end{tikzpicture}



end{document}