mjhjmtu

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

documentclass[a4paper, 12pt]book
usepackagepgfplots, tikz

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

begincenter
 begintikzpicture
 stencilptbig -1,1 i-1 $frac-1h^2_t$;
 stencilptbig 0,1 i $frac-2h^2_t+frac2h^2_x$;
 stencilptbig 0,0 ij-1 $frac1h^2_t$;
 stencilptbig 0,2 ij+1 $frac1h^2_t$; 
 stencilptbig 1,1 i+1 $frac-1h^2_t$;
 draw
 (i-1) -- (i) 
 (i) -- (i+1)
 (i) -- (ij-1)
 (i) -- (ij+1);
 endtikzpicture
endcenter
enddocument

I also tried newcommandstencilptbig[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
usepackagetikz
usetikzlibrarypositioning
begindocument
begintikzpicture[stencilptbig/.style=circle,draw,inner sep=0.1em, outer
sep=0pt, minimum size=0.7cm,font=scriptsize,
node distance=2mm]
node[stencilptbig] (i) $frac-2h^2_t+frac2h^2_x$;
node[stencilptbig,left=of i] (i-1) $frac-1h^2_t$;
node[stencilptbig,right=of i] (i+1) $frac-1h^2_t$;
node[stencilptbig,above=of i] (ij+1) $frac1h^2_t$;
node[stencilptbig,below=of i] (ij-1) $frac1h^2_t$;
draw
 (i-1) -- (i) 
 (i) -- (i+1)
 (i) -- (ij-1)
 (i) -- (ij+1);
endtikzpicture
enddocument

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.