Looking up strings by an index

Question

I'm using  pgfplotsinvokeforeach{0,1,2} {...} and would like to somehow dispatch on #1 to get one of three strings:

$s_A$ if #1 == 0
$s_B$ if #1 == 1
$s_C$ if #1 == 2

Is there an easy way to do this? I've tried using xstring's StrMid but it bombs and complains about let doing something wrong.

Alan Xiang · Answer

You can try this solution based on LaTeX3. Not sure if it works with pgfplotsinvokeforeach in your code though.
documentclass{article}
usepackage{expl3}

ExplSyntaxOn
newcommand{intcase}[1]{
  int_case:nn {#1} {
    {1} {$sc_math_subscript_token A$}
    {2} {$sc_math_subscript_token B$}
    {3} {$sc_math_subscript_token C$}
  }
}
ExplSyntaxOff

begin{document}
intcase{1}intcase{2}intcase{3}
end{document}

Steven B. Segletes · Answer

documentclass{article}
usepackage{pgfplotstable}
pgfplotsset{compat=1.16}
newcounter{tmpcnt}
begin{document}
pgfplotsinvokeforeach{0,1,2}{%
  setcounter{tmpcnt}{numexpr1+#1}$s_{Alph{tmpcnt}}$}
end{document}

Looking up strings by an index

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