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千问AI|用iris数据python绘制柱状图,小提琴图+箱线图

  • 2026-07-01 02:56:27
千问AI|用iris数据python绘制柱状图,小提琴图+箱线图

用iris数据,python绘制柱状图,有差异分析和标记,包括组间差异

基础实现

在 R 语言中,实现带有差异分析和自动标记的柱状图,最优雅且符合现代科研绘图标准的方法是使用 ggplot2 配合 ggpubr 扩展包。

1. 环境准备

首先,你需要安装并加载必要的 R 包(如果尚未安装,请先运行 install.packages(c("ggplot2", "ggpubr", "dplyr"))):

library(ggplot2)library(ggpubr)library(dplyr)

2. 完整代码实现

这段代码会加载内置的 iris 数据集,计算不同品种(Species)花萼长度(Sepal.Length)的均值,进行 T 检验,并自动在柱状图上标注显著性差异(如 *** 或 ns)。

# 1. 数据准备与均值计算# 使用内置的 iris 数据集,计算各品种的均值和标准差iris_summary <- iris %>%  group_by(Species) %>%  summarise(    mean = mean(Sepal.Length),    sd = sd(Sepal.Length)  ) %>%  ungroup()# 2. 绘制基础柱状图 (带误差棒)p <- ggplot(iris_summary, aes(x = Species, y = mean, fill = Species)) +  geom_bar(stat = "identity", width = 0.6, color = "black") + # 绘制柱状图  geom_errorbar(aes(ymin = mean - sd, ymax = mean + sd), width = 0.2, size = 0.8) + # 添加标准差误差棒  scale_fill_brewer(palette = "Set2") + # 使用美观的配色  labs(title = "Iris Dataset - Sepal Length Comparison",       x = "Species", y = "Sepal Length (cm)") +  theme_minimal() + # 使用简洁的主题  theme(plot.title = element_text(hjust = 0.5, size = 14, face = "bold"))# 3. 定义需要进行组间比较的配对my_comparisons <- list(c("setosa""versicolor"), c("setosa""virginica"), c("versicolor""virginica"))# 4. 自动进行统计检验并添加标注# 使用 stat_compare_means 函数自动添加显著性标记final_plot <- p + stat_compare_means(  comparisons = my_comparisons, # 指定比较的组别  method = "t.test",            # 指定统计检验方法为独立样本T检验  label = "p.signif",           # 标注格式显示为星号(如 *, **)  vjust = 0.5,                  # 调整标注文字的垂直位置  size = 6                      # 调整标注文字的大小)# 5. 显示图表print(final_plot)

代码核心原理解析:

  • 数据聚合 (dplyr)
    ggplot2 绘制柱状图时,如果直接传入原始数据,默认会进行计数。因此,我们先用 dplyr 的 group_by 和 summarise 提前计算出每组花萼长度的均值 (mean) 和标准差 (sd)
  • 基础绘图 (ggplot2)
    • geom_bar(stat = "identity")
      :告诉 ggplot 直接使用我们计算好的均值来绘制柱子的高度。
    • geom_errorbar
      :利用计算好的标准差,为每个柱子添加上下波动的误差线。
  • 差异分析与标记 (ggpubr)
    • stat_compare_means()
       是 ggpubr 包的核心函数,它可以无缝叠加在 ggplot 图形上。
    • comparisons
      指定了你想要进行两两比较的组别。
    • method = "t.test"
      指定使用独立样本 T 检验(如果你需要非参数检验,可以将其替换为 "wilcox.test")。
    • label = "p.signif"
      会自动将计算出的 P 值转化为直观的星号(例如 P < 0.05 显示 *,P < 0.01 显示 **,不显著则显示 ns)。

运行上述代码后,你将得到一张高度定制化的柱状图,不仅包含了误差棒,还自动完成了组间差异的统计学检验和显著性标记。

添加坐标轴的线,去掉背景横线
library(ggplot2)library(ggpubr)library(dplyr)# 定义比较组my_comparisons <- list(  c("setosa""versicolor"),   c("setosa""virginica"),   c("versicolor""virginica"))# 绘制带有坐标轴线且无背景网格的柱状图ggplot(iris, aes(x = Species, y = Sepal.Length, fill = Species)) +  # 绘制柱状图(自动计算均值)  stat_summary(fun = mean, geom = "bar", width = 0.6, color = "black") +  # 绘制误差棒(自动计算标准差)  stat_summary(fun.data = mean_sd, geom = "errorbar", width = 0.2, size = 0.8) +  # 设置配色  scale_fill_brewer(palette = "Set2") +  # 添加显著性差异横线  stat_compare_means(    comparisons = my_comparisons,    method = "t.test",    label = "p.signif",    vjust = 0.5,    size = 6  ) +  # 基础标签设置  labs(title = "Iris Dataset - Sepal Length Comparison",       x = "Species", y = "Sepal Length (cm)") +  # 【核心修改】使用经典主题(自带坐标轴线,无背景网格)  theme_classic() +  # 微调标题样式  theme(    plot.title = element_text(hjust = 0.5, size = 14, face = "bold"),    legend.position = "none"  )
线上不要标记星号,标P值
library(ggplot2)library(ggpubr)library(dplyr)# 定义需要进行两两比较的组别my_comparisons <- list(  c("setosa""versicolor"),   c("setosa""virginica"),   c("versicolor""virginica"))# 绘制带有具体P值的柱状图ggplot(iris, aes(x = Species, y = Sepal.Length, fill = Species)) +  # 绘制柱状图  stat_summary(fun = mean, geom = "bar", width = 0.6, color = "black") +  # 绘制误差棒  stat_summary(fun.data = mean_sd, geom = "errorbar", width = 0.2, size = 0.8) +  # 设置配色  scale_fill_brewer(palette = "Set2") +  # 核心修改:将 label 改为 "p.format" 以显示具体P值  stat_compare_means(    comparisons = my_comparisons,    method = "t.test",    label = "p.format",          # 【核心修改】显示具体P值    label.x = 1.5,               # 【可选】微调P值标注的横向位置,防止重叠    vjust = 0.5,                 # 微调P值标注的纵向位置    size = 5                     # 调整P值文字的大小  ) +  # 标签与主题设置  labs(title = "Iris Dataset - Sepal Length Comparison",       x = "Species", y = "Sepal Length (cm)") +  theme_classic() +  theme(    plot.title = element_text(hjust = 0.5, size = 14, face = "bold"),    legend.position = "none"  )
把柱状图变为小提琴图,其他都不变,去掉误差线
再套一个箱线图,白色
library(ggplot2)library(ggpubr)library(dplyr)# 定义需要进行两两比较的组别my_comparisons <- list(  c("setosa""versicolor"),   c("setosa""virginica"),   c("versicolor""virginica"))# 绘制叠加白色箱线图的小提琴图ggplot(iris, aes(x = Species, y = Sepal.Length, fill = Species)) +  # 绘制小提琴图  geom_violin(trim = FALSE, alpha = 0.7) +   # 【核心新增】叠加窄箱线图,设置填充为白色  geom_boxplot(width = 0.1, fill = "white", outlier.shape = NA) +   # 设置配色  scale_fill_brewer(palette = "Set2") +  # 添加显著性差异横线并标注具体P值  stat_compare_means(    comparisons = my_comparisons,    method = "t.test",    label = "p.format",          # 显示具体P值    vjust = 0.5,                     size = 5                       ) +  # 标签与主题设置  labs(title = "Iris Dataset - Sepal Length Comparison",       x = "Species", y = "Sepal Length (cm)") +  # 使用经典主题(自带坐标轴线,无背景网格)  theme_classic() +  theme(    plot.title = element_text(hjust = 0.5, size = 14, face = "bold"),    legend.position = "none"  )
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  1. CONNECT:[ UseTime:0.000687s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000928s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002034s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002011s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000764s ]
  6. SELECT * FROM `set` [ RunTime:0.006264s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000831s ]
  8. SELECT * FROM `article` WHERE `id` = 493390 LIMIT 1 [ RunTime:0.011268s ]
  9. UPDATE `article` SET `lasttime` = 1783063316 WHERE `id` = 493390 [ RunTime:0.020392s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.006090s ]
  11. SELECT * FROM `article` WHERE `id` < 493390 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.003062s ]
  12. SELECT * FROM `article` WHERE `id` > 493390 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003678s ]
  13. SELECT * FROM `article` WHERE `id` < 493390 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004995s ]
  14. SELECT * FROM `article` WHERE `id` < 493390 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.014817s ]
  15. SELECT * FROM `article` WHERE `id` < 493390 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007352s ]
0.163703s