如何为Python gnuplotlib绘图添加自定义X轴刻度？

问题出在你传递给xtics参数的格式上，gnuplotlib要求自定义刻度的元组顺序是**(位置, 标签)**，而非你写的(标签, 位置)。另外也可以直接传入符合gnuplot语法的字符串来定义刻度。

修复方案1：调整元组顺序 #

import numpy as np
import gnuplotlib as gp

xtics_positions = [0, 2, 4, 6, 8]
xtics_labels = ["zero", "two", "four", "six", "eight"]
# 修正顺序：(位置, 标签)
xtics = [(pos, label) for pos, label in zip(xtics_positions, xtics_labels)]

datapoints = np.array([ 0,  1,  0,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0, 11,  5,  5,  2, 21,  1, 21,  0,  8, 62, 56,  0,  0,  0,  6,  3, 32,  7, 17,  1,  6, 10, 12,  0, 21, 11,  6, 14,  1, 15, 25, 30, 17, 11,  6,  4,  0])
gp.plot(datapoints, xtics=xtics)

修复方案2：使用gnuplot原生语法字符串 #

如果你更习惯gnuplot的原生写法，可直接构造字符串传入：

import numpy as np
import gnuplotlib as gp

xtics_str = "0 'zero', 2 'two', 4 'four', 6 'six', 8 'eight'"

datapoints = np.array([ 0,  1,  0,  1,  0,  0,  0,  0,  0,  0,  0,  0,  0, 11,  5,  5,  2, 21,  1, 21,  0,  8, 62, 56,  0,  0,  0,  6,  3, 32,  7, 17,  1,  6, 10, 12,  0, 21, 11,  6, 14,  1, 15, 25, 30, 17, 11,  6,  4,  0])
gp.plot(datapoints, xtics=xtics_str)

两种方式都能正确渲染自定义的X轴刻度标签。

内容的提问来源于stack exchange，提问作者Eric G