Gnuplot：在多图中对齐直方图的条形图

Question

我正在尝试在多图中绘制 3 个直方图。三个 dat 文件是：

Sta1.dat:

attn,   mu2 ,  mu3, mu4
20,    4.9, 17.1, 78.1 
25,    4.0, 22.0, 74.0 
30,    2.0, 17.0, 81.0 
35,   11.5, 21.7, 66.8 
40,    4.7, 18.0, 77.4 
45,    3.8,  8.9, 87.3 
50,    0.6, 17.3, 82.1 
55,    2.0,  3.4, 94.6 
60,    1.0,  1.3, 97.6 

Sta2.dat

attn,   mu2 ,  mu3, mu4
20,   5.3, 20.6, 74.2
25,   9.2, 27.2, 63.6
30,   9.5, 20.3, 70.2
35,   9.9, 22.1, 68.0
40,   5.3, 19.0, 75.7
45,   3.4,  9.6, 86.9
50,   2.3, 15.3, 82.4
55,   2.7, 10.6, 86.7
60,   1.7,  1.0, 97.3

Sta3.dat

attn,   mu2 ,  mu3, mu4
20,    6.8, 20.6, 72.6
25,    6.2, 29.5, 64.3
30,    5.3, 23.6, 71.1
35,    4.5, 15.6, 79.9
40,    5.5, 17.4, 77.1
45,    3.7, 10.5, 85.8
50,    9.1, 16.6, 74.3
55,    2.8,  3.8, 93.4
60,    1.0,  1.6, 97.4

在num.jpg中，直方图的 Station2 和 Station3 条对齐，因为显示了图例。在 station1 中，我没有指定图例，因为直方图的条形图没有对齐。

有人可以帮助调整命令以对齐所有条形吗？

set terminal pngcairo
set output "num.png"
set style data histogram
set style histogram rowstacked
set style fill solid
set key outside
set boxwidth 0.5

set size 1,1
set origin 0,0

set datafile separator ","
set multiplot layout 4,1 

set ytics border font ",6" offset 0.7,0
set key title 'Signal Strength' font ",7"
set key font ",5"
set key bottom right
set size 1,0.25
set origin 0,0.50
set lmargin at screen 0.1
set tmargin at screen 0.48
set bmargin at screen 0.27
set rmargin at screen 0.85
set title "Station3" font ",6" offset 0,-0.7
set xtics border font ",6" offset 0,0.7
plot for [COL=2:4] 'sta3.dat' using COL:xtic(1) ti col
unset xtic

set size 1,0.25
set origin 0,0.75
set lmargin at screen 0.1
set tmargin at screen 0.73
set bmargin at screen 0.52
set rmargin at screen 0.85
set xzeroaxis
set title "Station2" font ",6" offset 0,-0.7
plot for [COL=2:4] 'sta2.dat' using COL:xtic(1) ti col
unset key

set size 1,0.25
set origin 0,0.95
set lmargin at screen 0.1
set tmargin at screen 0.96
set bmargin at screen 0.77
set rmargin at screen 0.85
set title "Station1" font ",6" offset 0,-0.7
plot for [COL=2:4] 'sta1.dat' using COL:xtic(1)
unset multiplot
exit

Answer 1

我对您的代码进行了一些更改以使用 multiplot 命令选项。我删除了单独的 margin、size 和 origin 调整，并在终端设置中应用了全局字体大小。奇怪的行为（我不知道如何）来自 ti col 最后一个 plot 命令。

set terminal pngcairo font ",8"
set output "num.png"
set style data histogram
set style histogram rowstacked
set style fill solid
set key outside
set boxwidth 0.5

set datafile separator ","

set key bottom right Left  # Better alignment to text
set key title 'Signal Strength' offset -1.5,0
set xtics nomirror
set yrange [0:100] # The same yrange to all plots

# layout, direction, 
# margins and 
# spacing for plots (see 'help multiplot')
set multiplot \
    layout 3,1 upwards \
    margins 0.08,0.85,0.08,0.94 \
    spacing 0.1,0.07
# ----------------------------------------------------
set title "Station3" offset 0,-0.7
plot for [COL=2:4] 'sta3.dat' using COL:xtic(1) ti col
# ----------------------------------------------------
set xtics tc bgnd # To draw an "invisible" xtics
set title "Station2"
plot for [COL=2:4] 'sta2.dat' using COL:xtic(1) ti col
# ----------------------------------------------------
unset key
set title "Station1"
plot for [COL=2:4] 'sta1.dat' using COL:xtic(1) ti col
unset multiplot
exit

最终结果：

Gnuplot：在多图中对齐直方图的条形图

Gnuplot: Aligning bars of histogram in multiplot

plot

gnuplot

histogram