Cfrgtkky

Here is a minimal example :

begin{filecontents*}{data.csv}

a,b,c,d

1,4,5,1

2,3,1,5

3,5,6,1

4,1,4,9

5,3,4,7

end{filecontents*}



documentclass{article}

usepackage[utf8]{inputenc}

usepackage{csvsimple}

usepackage{tikz}



begin{document}

begin{tikzpicture}

draw plot coordinates {%

csvreader[head to column names]{data.csv}{}{(a,b) }

};

end{tikzpicture}

end{document}

The command csvreader[head to column names]{data.csv}{}{(a,b) } extracts coordinates (columns a and c) from the CSV file data.csv :

(1,4) (2,3) (3,5) (4,1) (5,3)

And yet, it seems that I can't plot the points above using tikz :

Package tikz Error: Cannot parse this coordinate

Any idea ?

If you need to plot data from files, I think you'll be much happier if you use PGFPlots instead of the native plot functionality of TikZ. Here's a very simple example of plotting your example data to get you started.

PGFPlots is very customizable, you can tweak virtually every aspect of your plots, and it's much more user-friendly than if you tried to knit everything yourself.

documentclass{article}

usepackage{pgfplots}

usepackage{filecontents}

begin{filecontents*}{data.csv}

a,b,c,d

1,4,5,1

2,3,1,5

3,5,6,1

4,1,4,9

5,3,4,7

end{filecontents*}





begin{document}

begin{tikzpicture}

begin{axis}

addplot table [x=a, y=c, col sep=comma] {data.csv};

end{axis}

end{tikzpicture}

end{document}

It seems that it's impossible to call csvreader inside draw plot coordinates { }. To avoid the plot command and still being able to plot lines between points, I need to use xdef to remember the previous point.

begin{filecontents*}{data.csv}

a,b,c,d

1,4,5,1

2,3,1,5

3,5,6,1

4,1,4,9

5,3,4,7

end{filecontents*}



documentclass{article}

usepackage[utf8]{inputenc}

usepackage{csvsimple}

usepackage{tikz}



begin{document}

begin{tikzpicture}

    csvreader[ head to column names,%

                late after head=xdefaold{a}xdefbold{b},%

                after line=xdefaold{a}xdefbold{b}]%

                {data.csv}{}{%

    draw (aold, bold) -- (a,b) node {$times$};

    }

end{tikzpicture}

end{document}

I get the output below. Now I can get back to work and print a whole bunch of data in my report ;-) I love it !

Another example with csvsimple, tikz and pgf-pie.

begin{filecontents*}{newData.csv}

20,30,50

end{filecontents*}



documentclass[10pt,a4paper]{article}

usepackage[utf8]{inputenc}



usepackage{csvsimple}

usepackage{tikz}

usepackage{pgf-pie}



begin{document}



begin{tikzpicture}

csvreader[no head]%

{newData.csv}

{1=colVali,2=colValii,3=colValiii}

{%

  pie[polar, explode=0.1]

  {colVali/A, colValii/B, colValiii/C}

}

end{tikzpicture}



end{document}

Which produces the following pie chart: