Deprecated syntax

Gnuplot version 4 deprecated certain syntax used in earlier versions but provided a configuration option that allowed backward compatibility. Support for the old syntax has now been removed.

Deprecated in version 4 and removed in version 5:

      set title "Old" 0,-1
      set data linespoints
      plot 'file' thru f(x)
      plot 1 2 4               # horizontal line at y=1
      update

Current equivalent:

      TITLE = "New"
      set title TITLE offset char 0, char -1
      set style data linespoints
      plot 'file' using 1:(f(column(2)))
      plot 1 linetype 2 pointtype 4
      save fit "filename"

Deprecated in version 5

      if (defined(VARNAME)) ...
      set style increment user
      call 'script' 1.23 ABC
         (in script:  print $0, "$1", "number of args = $#")
      set fontpath
      set clabel
      fit control variables FIT_*

Current equivalent:

      if (exists("VARNAME")) ...
      set linetype
      call 'script' 1.23 "ABC"
         (in script:  print ARG1, ARG2, "number of args = ", ARGC
      set cntrlabel
      set fit <option> <value>

Deprecated in version 5.4

      # use of a file containing `reread` to perform iteration
      N = 0;  load "file-containing-reread";
      file content:
          N = N+1
          plot func(N,x)
          pause -1
          if (N<5) reread

Current equivalent

      do for [N=1:5] {
          plot func(N, x)
          pause -1
      }