Duplicate values when writing value near coordinate

Question

I am using this code, taken from my question here. The problem arises when two x values have the same y value. Then the label I want to write near the coordinate overlaps with the other one. How can I resolve this issue, even specifically for this particular input?

\documentclass{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.9}
\usepackage{filecontents}
\begin{filecontents*}{mydata.dat}
  x_0 f(x) label
  %some comment
  0.5 0.24 0
  0.5 0.21 0.1
  0.5 0.18 0.5
  0.5 0.21 0.9
\end{filecontents*}

\begin{document}

\begin{tikzpicture}
    \begin{axis}[
        title = My title,
        xlabel = {$x$},
        ylabel = {$y$},
        legend entries = {A},
        every node near coord/.append style={anchor=south west},
    ]
    \addplot [nodes near coords, mark = *, blue, point meta = explicit symbolic] %table {Measurements/A.dat};
    table[meta = label] {mydata.dat};
    \end{axis}
\end{tikzpicture}
\end{document}

---

Relevant question lies here, however, I would like the labels I write near the coordinates to be separated by a comma, leaving the rest of the plot untouched.

Answer 1

You can use this answer by percusse and adjust the anchors

\documentclass{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.9}
\usepackage{filecontents}
\begin{filecontents*}{mydata.dat}
  x_0 f(x) label anchor
  %some comment
  0.5 0.24 0  east
  0.5 0.21 0.1 west
  0.5 0.18 0.5 east
  0.5 0.21 0.9 east
\end{filecontents*}

\begin{document}

\begin{tikzpicture}
    \begin{axis}[
        title = My title,
        xlabel = {$x$},
        ylabel = {$y$},
        legend entries = {A},
        point meta=explicit symbolic,
    ]
    \addplot [nodes near coords, mark = *, blue, point meta = explicit symbolic,visualization depends on={value \thisrow{anchor}\as\myanchor},
       every node near coord/.append style={anchor=\myanchor}] %table {Measurements/A.dat};
    table[meta = label] {mydata.dat};
    \end{axis}
\end{tikzpicture}
\end{document}

You have to add an extra column anchor in your data with the anchor values though.

While using north west etc use an extra pair of braces like

\begin{filecontents*}{mydata.dat}
  x_0 f(x) label anchor
  %some comment
  0.5 0.24 0  west
  0.5 0.21 0.1 {north west}
  0.5 0.18 0.5 west
  0.5 0.21 0.9 {south west}
\end{filecontents*}