Gnuplot绘制小提琴图：X轴未显示且与Y轴底部未对齐

问题描述 #

绘制小提琴图时遇到两个问题：

• 仅显示X轴刻度，未显示X轴轴线
• X轴未与Y轴范围的底部对齐

解决方案 #

只需修改代码末尾的几个设置项即可解决问题：

1. 调整border参数启用X轴对应的下边框
2. 将X轴刻度和轴线定位到Y轴范围的底部

修改后的完整代码 #

set terminal svg size 1920,1080
set output "pic.svg"

set print $viol0
        y = 0.24
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.48
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.28
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.56
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.52
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.32
            print sprintf(" 0.0 %8.5g", y)
            
        unset print
set print $viol1
        y = -0.24
            print sprintf(" 0.0 %8.5g", y)
            
        y = -0.16
            print sprintf(" 0.0 %8.5g", y)
            
        y = -0.44
            print sprintf(" 0.0 %8.5g", y)
            
        y = -0.28
            print sprintf(" 0.0 %8.5g", y)
            
        y = -0.28
            print sprintf(" 0.0 %8.5g", y)
            
        y = -0.56
            print sprintf(" 0.0 %8.5g", y)
            
        unset print
set print $viol2
        y = 0.0
            print sprintf(" 0.0 %8.5g", y)
            
        y = 1.0
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.5833333333333344
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.5000000000000009
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.7499999999999996
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.08333333333333348
            print sprintf(" 0.0 %8.5g", y)
            
        unset print
set print $viol3
        y = 0.3333333333333336
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.5999999999999998
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.5999999999999998
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.6666666666666664
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.6999999999999997
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.5666666666666671
            print sprintf(" 0.0 %8.5g", y)
            
        unset print
set print $viol4
        y = 1.2999999999999996
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.8499999999999999
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.975
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.7999999999999999
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.8499999999999999
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.7749999999999999
            print sprintf(" 0.0 %8.5g", y)
            
        unset print
set print $viol5
        y = 2.8666666666666694
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.6000000000000024
            print sprintf(" 0.0 %8.5g", y)
            
        y = 1.0666666666666682
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.9333333333333347
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.8666666666666665
            print sprintf(" 0.0 %8.5g", y)
            
        y = 0.733333333333333
            print sprintf(" 0.0 %8.5g", y)
            
        unset print
set title 'Overview'

set border 2
set xrange [33:36]
set xtics ("A" 34, "B" 35)
set xtics nomirror scale 0
set ytics nomirror rangelimited
unset key
set style data points

set linetype  9 lc "#800072b2" ps 0.5 pt 5
set linetype 10 lc "#8033bbbb" ps 0.5 pt 5


# set title "Same data - kernel density"
set style data filledcurves below
set auto x
unset ytics
set border 3
set margins screen .15, screen .85, screen .15, screen .85
set key

set table $kdensity0
plot $viol0 using 2:(1) smooth kdensity bandwidth 0.15 with filledcurves above y lt 9
unset table
set table $kdensity1
plot $viol1 using 2:(1) smooth kdensity bandwidth 0.15 with filledcurves above y lt 9
unset table
set table $kdensity2
plot $viol2 using 2:(1) smooth kdensity bandwidth 0.15 with filledcurves above y lt 9
unset table
set table $kdensity3
plot $viol3 using 2:(1) smooth kdensity bandwidth 0.15 with filledcurves above y lt 9
unset table
set table $kdensity4
plot $viol4 using 2:(1) smooth kdensity bandwidth 0.15 with filledcurves above y lt 9
unset table
set table $kdensity5
plot $viol5 using 2:(1) smooth kdensity bandwidth 0.15 with filledcurves above y lt 9
unset table
unset key

# --- 修改部分开始 ---
set border 1 | 2  # 同时启用下边框（X轴）和右边框（Y轴）
unset margins
set ytics nomirror rangelimited
set xtics nomirror scale 0 at y=-1  # 将X轴刻度定位到Y轴范围底部（y=-1）
# --- 修改部分结束 ---

set style boxplot nooutliers
set style fill solid bo -1
set boxwidth 0.075
set errorbars lt black lw 1

set xrange [-0.5 :(6-0.5)]
set xtics autofreq 1
set yrange [-1:2]

plot \
     $kdensity0 using (0 + $2/200.):1 with filledcurve above x=0 lt 9,\
     '' using (0 - $2/200.):1 with filledcurve below x=0 lt 9,\
     $viol0 using (0):2 with boxplot fc "white" lw 2,\
     $kdensity1 using (1 + $2/200.):1 with filledcurve above x=1 lt 9,\
     '' using (1 - $2/200.):1 with filledcurve below x=1 lt 9,\
     $viol1 using (1):2 with boxplot fc "white" lw 2,\
     $kdensity2 using (2 + $2/200.):1 with filledcurve above x=2 lt 9,\
     '' using (2 - $2/200.):1 with filledcurve below x=2 lt 9,\
     $viol2 using (2):2 with boxplot fc "white" lw 2,\
     $kdensity3 using (3 + $2/200.):1 with filledcurve above x=3 lt 9,\
     '' using (3 - $2/200.):1 with filledcurve below x=3 lt 9,\
     $viol3 using (3):2 with boxplot fc "white" lw 2,\
     $kdensity4 using (4 + $2/200.):1 with filledcurve above x=4 lt 9,\
     '' using (4 - $2/200.):1 with filledcurve below x=4 lt 9,\
     $viol4 using (4):2 with boxplot fc "white" lw 2,\
     $kdensity5 using (5 + $2/200.):1 with filledcurve above x=5 lt 9,\
     '' using (5 - $2/200.):1 with filledcurve below x=5 lt 9,\
     $viol5 using (5):2 with boxplot fc "white" lw 2

修改说明 #

• set border 1 | 2：Gnuplot的border参数为位掩码，1对应下边框（X轴），2对应右边框（Y轴），组合后可同时显示X轴和Y轴轴线
• set xtics ... at y=-1：强制X轴刻度和轴线对齐到Y轴范围的底部（即yrange最小值-1），解决X轴未对齐的问题

内容的提问来源于stack exchange，提问作者Andrea Manghi