使用Gnuplot中的公式添加误差线

Question

我有换能器数据，我知道我有一个突然的准确性：

我的问题是：如何将y-errorbars添加到现有代码中？

set xlabel "Time [min]" 
set ylabel "Temperature [Celsius]"
plot '150830AW.dat'  every ::1188::1231 using 4:52 w l lc rgb 'green' title "Run 1", \
    '150830AW.dat'  every ::1251::1284 using 4:52 w l lc rgb 'blue' title "Run 2", \
                        90 title "Standard" with lines linestyle 2

和

set xlabel "Time [min]"
set ylabel "Pressure [MPa]"
plot '2015 08 30 0000 Pelletizer Feed (Wide).dat'  every ::2372::2459 using 4:($8*0.006894759086775369) w l lc rgb 'green' title "Run 1", \
    '2015 08 30 0000 Pelletizer Feed (Wide).dat'  every ::2498::2565 using 4:($8*0.006894759086775369) w l lc rgb 'blue' title "Run 2"

Answer 1

看一下这些演示：errorbars。基本上你需要第三列错误。

由于压力准确度为0.5％，因此您必须将压力列乘以0.005，以使using 4:52成为using 4:52:($52*0.005)。

要激活错误栏，您需要将w l（即带有行）替换为with errorbars。

如果你想要行和错误栏，你必须保留你的行并添加这一新行，例如：

plot '150830AW.dat'  every ::1188::1231 using 4:52 w l lc rgb 'green' title "Run 1", \
     ''  every ::1188::1231 using 4:52:($52*0.005) w errorbar lc rgb 'green' notitle, \
     '150830AW.dat'  every ::1251::1284 using 4:52 w l lc rgb 'blue' title "Run 2", \
     ''  every ::1251::1284 using 4:52:($52*0.005) w errorbar lc rgb 'blue' notitle, \
     90 title "Standard" with lines linestyle 2

如果你想要更好的东西，请查看fill between curves