plot is the user-defined function from the file
/usr/share/octave/2.1.36/m/plot/plot.m

 - Function File:  plot (ARGS)
     This function produces two-dimensional plots.  Many different
     combinations of arguments are possible.  The simplest form is

          plot (Y)

     where the argument is taken as the set of Y coordinates and the X
     coordinates are taken to be the indices of the elements, starting
     with 1.

     If more than one argument is given, they are interpreted as

          plot (X, Y, FMT ...)

     where Y and FMT are optional, and any number of argument sets may
     appear.  The X and Y values are interpreted as follows:

        * If a single data argument is supplied, it is taken as the
          set of Y coordinates and the X coordinates are taken to be
          the indices of the elements, starting with 1.

        * If the first argument is a vector and the second is a
          matrix, the the vector is plotted versus the columns (or
          rows) of the matrix.  (using whichever combination matches,
          with columns tried first.)

        * If the first argument is a matrix and the second is a
          vector, the the columns (or rows) of the matrix are plotted
          versus the vector.  (using whichever combination matches,
          with columns tried first.)

        * If both arguments are vectors, the elements of Y are plotted
          versus the elements of X.

        * If both arguments are matrices, the columns of Y are plotted
          versus the columns of X.  In this case, both matrices must
          have the same number of rows and columns and no attempt is
          made to transpose the arguments to make the number of rows
          match.

          If both arguments are scalars, a single point is plotted.

     If the FMT argument is supplied, it is interpreted as follows.
     If FMT is missing, the default gnuplot line style is assumed.

    `-'
          Set lines plot style (default).

    `.'
          Set dots plot style.

    `@'
          Set points plot style.

    `-@'
          Set linespoints plot style.

    `^'
          Set impulses plot style.

    `L'
          Set steps plot style.

    `"#"'
          For boxes plot style.

    `"~"'
          For yerrorbars plot style.

    `">"'
          For xerrorbars plot style.
   `"~>"'
          For xyerrorbars plot style.

    `"#~"'
          For boxerrorbars plot style.

    `N'
          Interpreted as the plot color if N is an integer in the
          range 1 to 6.

    `NM'
          If NM is a two digit integer and M is an integer in the
          range 1 to 6, M is interpreted as the point style.  This is
          only valid in combination with the `@' or `-@' specifiers.

    `C'
          If C is one of `"r"', `"g"', `"b"', `"m"', `"c"', or `"w"',
          it is interpreted as the plot color (red, green, blue,
          magenta, cyan, or white).

    `";title;"'
          Here `"title"' is the label for the key.

    `+'
    `*'
    `o'
    `x'
          Used in combination with the points or linespoints styles,
          set the point style.

     The color line styles have the following meanings on terminals
     that support color.

          Number  Gnuplot colors  (lines)points style
            1       red                   *
            2       green                 +
            3       blue                  o
            4       magenta               x
            5       cyan                house
            6       brown            there exists

     The FMT argument can also be used to assign key titles.  To do
     so, include the desired title between semi-colons after the
     formatting sequence described above, e.g. "+3;Key Title;" Note
     that the last semi-colon is required and will generate an error if
     it is left out.

     Here are some plot examples:

          plot (x, y, "@12", x, y2, x, y3, "4", x, y4, "+")

     This command will plot `y' with points of type 2 (displayed as
     `+') and color 1 (red), `y2' with lines, `y3' with lines of color
     4 (magenta) and `y4' with points displayed as `+'.

          plot (b, "*")

     This command will plot the data in the variable `b' will be
     plotted with points displayed as `*'.

          t = 0:0.1:6.3;
          plot (t, cos(t), "-;cos(t);", t, sin(t), "+3;sin(t);");

     This will plot the cosine and sine functions and label them
     accordingly in the key.

See also: semilogx, semilogy, loglog, polar, mesh, contour, __pltopt__
bar, stairs, errorbar, gplot, gsplot, replot, xlabel, ylabel, and
title.



Additional help for built-in functions, operators, and variables
is available in the on-line version of the manual.  Use the command
`help -i <topic>' to search the manual index.

Help and information about Octave is also available on the WWW
at http://www.octave.org and via the help-octave@bevo.che.wisc.edu
mailing list.