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Hello everyone, I tried to get symbolic values x1, x2, x3, x4 on x axis and C(x1),...,C(x4) on y axis.

\begin{tikzpicture}
\begin{axis}[
xlabel={$x$},
ylabel={$y$},
axis lines=center,
symbolic x coords={$x_1$, $x_2$, $x_3$, $x_4$, $x_5$},
symbolic y coords={$C(x_1)$, $C(x_2)$, $C(x_3),
$C ...