Gnuplot 映射

Question

我在尝试使用 gnuplot 中的矢量场绘制一些 3d 映射时遇到问题，问题是，我想绘制梯度图，然后在地图上方绘制一个矢量场。我有这样做的代码：

####
reset
clear

set title '{/:Bold Retrato de fase b=1.120}' font ",18"
set xlabel "{/:Bold x1}"
show xlabel
set xrange[0:1]

set ylabel "{/:Bold x2}" 
show ylabel
set yrange [0:1]
set multiplot
set multiplot layout 1,1
set origin 0,0

set palette defined ( 0 'white', 1 'green', 3 'blue' )
set pm3d map
set pm3d depthorder hidden3d

set key top left
set key Left
set samples 100,100
set style increment default
set style fill transparent

set arrow from 1,0 to 0,0.7692307692 nohead front
set arrow from 0,1 to 0.7692307692,0  nohead front

set object circle at graph 0,1 radius char 1 front \
    fillcolor rgb 'black' fillstyle solid noborder
set object circle at graph 1,0 radius char 1 front \
    fillcolor rgb 'black' fillstyle solid noborder

set pm3d
splot  "phase_portrait.txt" u 1:2:5 notitle  w pm3d
unset pm3d

plot "arrows.txt" u 1:2:3:4 w vectors filled head lc rgb 'black' notitle
####

这些是 phase_portrait.txt 存档的几行（每次 x 更改时我都会在存档中放一个空行）：

0.000000     0.000000    0.000000    0.000000    0.000000 
0.000000     0.010000    0.000000    0.022222    0.117624 
0.000000     0.020000    0.000000    0.022222    0.230543 
0.000000     0.030000    0.000000    0.022222    0.338829 
0.000000     0.040000    0.000000    0.022222    0.442552 
0.000000     0.050000    0.000000    0.022222    0.541785 
0.000000     0.060000    0.000000    0.022222    0.636598 
0.000000     0.070000    0.000000    0.022222    0.727063

这些来自 arrows.txt :

0.000000     0.000000    0.000000    0.000000  
0.000000     0.100000    0.000000    0.022222  
0.000000     0.200000    0.000000    0.022222  
0.000000     0.300000    0.000000    0.022222  
0.000000     0.400000    0.000000    0.022222  
0.000000     0.500000    0.000000    0.022222  
0.000000     0.600000    0.000000    0.022222  
0.000000     0.700000    0.000000    0.022222

无论我做什么，向量的输出都不匹配梯度图。我添加输出图像：

Answer 1

这里不用multiplot也不需要用splot。下面的最小示例生成一些测试数据以供说明。我希望你能根据你的需要调整代码。

代码：

### overlay of map and vectors
reset session

# create some test data for map
set samples 100
set isosamples 100
set table $Data
    plot '++' u 1:2:(*) w table
unset table

# create some test data for vectors
set samples 10
set isosamples 10
set table $Vectors
    plot '++' u 1:2:(/sqrt(**2+**2)):(/sqrt(**2+**2)) w table
unset table

set xrange[-5:5]
set yrange[-5:5]
set palette defined ( 0 'white', 1 'green', 3 'blue' )

plot $Data u 1:2:(*) w image, \
     $Vectors u 1:2:3:4 w vec lc rgb "black" notitle
### end of code

结果：

Gnuplot 映射

Gnuplot mapping

gnuplot

vector-graphics

3d-mapping