[Tex/LaTex] Modulo calculation in PGFplots tick label


I am printing a diagram and want to use a_[0…3] as tick labels on the x-axis. Right now I have a[0…7] as labels and look for a way to print a[\tick mod 4] (i.e. a_0, a_1, a_2, a_3, a_0, a_1, a_2, a_3). I tried using the solutions found found here (How do I calculate n modulo 3 in LaTeX?), but they all bring up errors when used in the line xticklabel={$a_{\pgfmathprintnumber[int trunc]{\tick}}$}.

Here is an MWE. Can anyone help?


         xticklabel={$a_{\pgfmathprintnumber[int trunc]{\tick}}$},
         yticklabel={$b_{\pgfmathprintnumber[int trunc]{\tick}}$}

   \addplot coordinates {(0,3) (1,2) (2,1) (3,0)} {};
   \addplot coordinates {(1,3) (2,2) (3,1) (4,0)} {};
   \addplot coordinates {(2,3) (3,2) (4,1) (5,0)} {};
   \addplot coordinates {(3,3) (4,2) (5,1) (6,0)} {};


Best Answer

You can change one line as follows:


\pgfmathparse evaluates its argument as a mathematical expression, but does not return a result. It normally handles floating-point numbers, so we use int to truncate the resultant value to an integer. \pgfmathresult prints the result of the most-recent invocation of \pgfmathparse.

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