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
     }