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Gnuplot
  1. Gnuplot cumulative flow chart

    loc.txt

    # date      iphone  common  ipad    xxx
    2010-02-08  9370       0       0       0    # iphone 1.0
    2010-04-22  9602       0       0       0    # iphone 2.0
    2010-06-03  9602    1354    4820       0    # ipad 1.0
    2010-10-07  9602    1869    5536       0    # ipad 2.0
    2011-03-01  8892    4041    9356    6046    # xxx 1.0
    2011-05-06  8648    5973    6960    6046    # iphone 3.0
    

    loc.gp

    set terminal png size 600, 350
    
    set output "loc.png"
    
    set title "Projects Lines of Code"
    set key left
    
    set timefmt "%Y-%m-%d"
    set format x "%Y-%m-%d"
    set grid
    
    set xdata time
    set xtics rotate by -45
    set xrange ["2010-03-01":"2011-06-01"]
    
    plot "loc.txt" using 1:($5+$4+$3+$2) title "xxx" with filledcurves y1=0 lt rgb "#cc3333", \
         "loc.txt" using 1:($4+$3+$2) title "iPad" with filledcurves y1=0 lt rgb "#cc9933", \
         "loc.txt" using 1:($3+$2) title "Common Lib" with filledcurves y1=0 lt rgb "#669933", \
         "loc.txt" using 1:2 title "iPhone" with filledcurves y1=0 lt rgb "#336699"
    

    Drawing the chart

    $ gnuplot loc.gp && open loc.png
    
  2. gnuplot heatmap

    map.txt

    n_0_0   , n_0_1   , ..., n_0_100
    ...
    n_2682_0, n_2682_1, ..., n_2682_100
    

    heatmap.gp

    set terminal png
    set output "heatmap.png"
    set size ratio 0.5
    set title "USD/CHF: PnL following daily trend, in pips"
    
    set xlabel "SL/TP - 200"
    set ylabel "Days since 2007-01-01"
    
    set tic scale 0
    
    set palette rgbformulae 22,13,10
    set palette negative
    
    set cbrange [-10000:10000]
    #unset cbtics
    
    set xrange [0:99.5]
    set yrange [0:2683]
    
    set view map
    
    splot 'map.txt' matrix with image
    

    Drawing the map

    $ gnuplot heatmap.gp && open heatmap.png