GNUPLOT

~hpgavin/gnuplot.html

set terminal postscript eps enhanced            //output to a .ps file;
set output "aaa.ps"                        //name of the .ps file
set multiplot                              //multiple plot in one file
set style line 2 lt 1 lw 2                //line style 2 = lt 1 lw 2
plot "abcd.dat" ls 2                       // plot data in "abcd.dat" with line style 2

set pointsize 1.5                                                          //change pointsize 

unset multiplot                           //stop multiplot
set terminal x11                           // standard window output

      Create a title:                  > set title "Force-Deflection Data" 
      Put a label on the x-axis:       > set xlabel "Deflection (meters)"
      Put a label on the y-axis:       > set ylabel "Force (kN)"
      Change the x-axis range:         > set xrange [0.001:0.005]
      Change the y-axis range:         > set yrange [20:500]
      Have Gnuplot determine ranges:   > set autoscale
      Move the key:                    > set key 0.01,100
      Delete the key:                  > unset key
      Put a label on the plot:         > set label "yield point" at 0.003, 260 
      Remove all labels:               > unset label
      Plot using log-axes:             > set logscale
      Plot using log-axes on y-axis:   > unset logscale; set logscale y 
      Change the tic-marks:            > set xtics (0.002,0.004,0.006,0.008)
      Return to the default tics:      > unset xtics; set xtics auto

plot  "force.dat" using 1:2 title 'Column', \                        //specify which colume of data to use,注意逗号， \  是断行符，后面不要打空格
                      "force.dat" using 1:3 title 'Beam'

gnuplot> plot "test.dat" using 1:2 notitle with points, \       //draw the data with points
>             "test.dat" using 1:2 smooth csplines \                 //draw the data with splines, connect all of them
>                                  title "spline" with lines,\ 
>             "test.dat" using 1:2 smooth bezier \                    //draw the data with bezier, connect all of them
>                                  title "bezier" with lines