Ykhjuy

I want to increase the spacing between 2 nodes of a stencil. The original design of the stencil comes form this question.

documentclass[a4paper, 12pt]{book}

usepackage{pgfplots, tikz}



newcommand{stencilptbig}[4]{node[circle,draw,inner sep=0.1em, outer sep=0pt, minimum size=0.7cm,font=normalfont,#1] at (#2) (#3) {#4}}

begin{document}



begin{center}

    begin{tikzpicture}

    stencilptbig {-1,1}    {i-1}   {$frac{-1}{h^2_t}$};

    stencilptbig {0,1}     {i}     {$frac{-2}{h^2_t}+frac{2}{h^2_x}$};

    stencilptbig {0,0}     {ij-1}      {$frac{1}{h^2_t}$};

    stencilptbig {0,2}     {ij+1}      {$frac{1}{h^2_t}$};    

    stencilptbig {1,1}     {i+1}   {$frac{-1}{h^2_t}$};

    draw

    (i-1)   --  (i) 

    (i)     --  (i+1)

    (i)     --  (ij-1)

    (i)     --  (ij+1);

    end{tikzpicture}

end{center}

end{document}

I also tried newcommand{stencilptbig}[4]{node[circle,draw,inner sep=0.1em, outer sep=0pt, minimum size=0.7cm,font=normalfont,#1, node distance=2cm] at (#2) (#3) {#4}} according to that question but it didn't work

By the way: If there is an easier way to draw the whole thing, please let know.

Same comments as in my previous answer apply here. ;-)

documentclass[a4paper, 12pt]{book}

usepackage{tikz}

usetikzlibrary{positioning}

begin{document}

begin{tikzpicture}[stencilptbig/.style={circle,draw,inner sep=0.1em, outer

sep=0pt, minimum size=0.7cm,font=scriptsize},

node distance=2mm]

node[stencilptbig] (i) {$frac{-2}{h^2_t}+frac{2}{h^2_x}$};

node[stencilptbig,left=of i] (i-1)  {$frac{-1}{h^2_t}$};

node[stencilptbig,right=of i] (i+1)  {$frac{-1}{h^2_t}$};

node[stencilptbig,above=of i] (ij+1)  {$frac{1}{h^2_t}$};

node[stencilptbig,below=of i] (ij-1)  {$frac{1}{h^2_t}$};

draw

    (i-1)   --  (i) 

    (i)     --  (i+1)

    (i)     --  (ij-1)

    (i)     --  (ij+1);

end{tikzpicture}

end{document}

You may also draw the lines with

draw (i) edge   (i-1)  edge  (i+1) edge  (ij-1) edge  (ij+1);

Depending on what you really want to achieve in the end, you may want to use chains or other tricks. And almost certainly someone will want use a matrix here. I guess that what is most elegant can only decided when it is clear what the full picture is.