GNU Info

(gnuplot.info)missing

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 The `set missing` command allows you to tell `gnuplot` (Note: gnuplot ) what
 character is used in a data file to denote missing data.

 Syntax:
       set missing {"<character>"}
       show missing

 Example:
       set missing "?"

 would mean that, when plotting a file containing

          1 1
          2 ?
          3 2

 the middle line would be ignored.

 There is no default character for `missing`.