LaTeX forum ⇒ Graphics, Figures & TablesGrid with colored Cells

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Grid with colored Cells

Postby tlapeg07 » Wed Jun 05, 2013 7:03 pm


I would like to build a grid and to specify the color of each cell. The grid is very large so I want to do it with file data. I have absolutely no idea of how to do it. Do you have any idea ?

The idea is to obtain in LaTeX what you obtain with Excel when you use the conditional formatting on a grid of values. Here I do not want to draw the values, but only the corresponding color (there is no place to write the numbers.)

Thank you in advance.


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Postby tom » Tue Jun 11, 2013 4:32 am


That's an interesting question. You could make your life easier and use e.g. R to plot a heat map. If you rather do it in TeX, I recommend using pgf (TiKZ). You can start from here and read your data as shown here.

Let me know if you get stuck.

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Postby tlapeg07 » Wed Jun 12, 2013 9:03 am


I've tried several ways, and in the end, it turned out to be easier in this way:
  1. \pgfmathsetmacro{\minval}{0}
  2. \pgfmathsetmacro{\maxval}{2}
  3. \pgfmathsetmacro{\colstep}{100/(\maxval-\minval)}
  4. \begin{tikzpicture}[scale=0.3]
  5. \foreach \x/\y/\z in {
  6. 1/0/1,
  7. 22/0/1,
  8. 40/0/1,
  9. 53/0/1,
  10. ...
  11. 187/99/1
  12. }
  13. {
  14. \pgfmathsetmacro{\ptcol}{\colstep*(\z-\minval)}
  15. \fill[gray!\ptcol!white] (\x/4-0.25,\y/4-0.25) rectangle (\x/4,\y/4);
  16. }
  17. \draw (-0.25,-0.25) rectangle (200/4-0.25, 100/4-0.25);
  18. \end{tikzpicture}

However, it is difficult to show more than 5000 cells (=5000 lines of data).
To increase the number of cells that I can show, I used a gray to white gradient color. Thus, I show gray and light gray cells, but there is no need to specify the white cells, which correspond then to the background.

Hope it helps someone else.

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