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用Python做科研级画图—— 不确定性表达:fill_between置信区间带

  • 2026-03-20 12:47:30
用Python做科研级画图—— 不确定性表达:fill_between置信区间带

大家好,我是你们的小帅学长。

很多同学画折线图时会默认只画“均值/预测值”那一条主线,图看起来干净、趋势也很清楚——但只要进入论文写作或答辩现场,几乎一定会被问到一句话:

“这条曲线稳吗?波动范围多大?差异显著吗?”

这句话背后的本质是:

科研不只关心“结果是什么”,还关心“结果有多可信”。

而把不确定性画出来,就是让你的图从“展示结果”升级到“表达可信度”。

这一篇我们用 Matplotlib 里最常用、也最标准的方式:fill_between,来画置信区间带/波动带。

01.先讲清楚:你画的“带子”到底是什么?

fill_between 画出来的阴影带,本质上是在表达:

某个中心曲线(均值/中位数/预测值)周围的范围

常见的三种“带子”含义(你写论文时一定要在图注说清楚):

均值 ± 标准差(mean ± std):展示波动性(不等于置信区间)

置信区间(CI,比如 95% CI):展示均值估计的不确定性

分位带(quantile band,如 10–90%):展示分布范围(更稳健)

02.什么时候必须画不确定性?

大多数场景如下:

多次重复实验 / 多站点 / 多年份:你展示的是总体趋势

模型对比:你想表达“谁更稳定/更可靠”

预测曲线:你想说明“预测区间”而不只是点估计

论文/答辩:别人一定会追问稳定性与误差来源

03.fill_between 的论文级写法

先有中心线:y_mean

再有上下界:y_low, y_high

fill_between(x, y_low, y_high, alpha=...) 画带子

最后再把中心线画在带子上面

04.直接可用模板:均值 + 95% CI

下面这段代码会输出一张“论文常见”的置信区间带折线图:

import osimport numpy as npimport matplotlib as mplimport matplotlib.pyplot as pltfrom matplotlib import font_manager as fmfrom matplotlib.ticker import MaxNLocator, FormatStrFormatter# == 字体 ==win_fonts = r"C:\Windows\Fonts"for p in [   os.path.join(win_fonts, "times.ttf"),   os.path.join(win_fonts, "timesbd.ttf"),    os.path.join(win_fonts, "timesi.ttf"),    os.path.join(win_fonts,  "simsun.ttc"),]:    if os.path.exists(p):        try:            fm.fontManager.addfont(p)        except Exception:            passmpl.rcParams["font.family"] = ["Times New Roman""SimSun"]mpl.rcParams["axes.unicode_minus"] = Falsempl.rcParams["mathtext.fontset"] = "custom"mpl.rcParams["mathtext.rm"] = "Times New Roman"mpl.rcParams["mathtext.it"] = "Times New Roman:italic"mpl.rcParams["mathtext.bf"] = "Times New Roman:bold"OUT_DIR = r"D:\py_figs "os.makedirs(OUT_DIR, exist_ok=True)# == 示例数据 ==rng = np.random.default_rng(3)x = np.linspace(010120)n_runs = 30ys = []for _ in range(n_runs):noise= 0.15 * rng.standard_normal(len(x))    y= 0.9 * np.sin(x) + 0.1 + noise    ys.append(y)ys = np.vstack(ys)  # (n_runs, len(x))# 均值y_mean = ys.mean(axis=0)# 95% CI(近似):mean ± 1.96 * (std/sqrt(n))y_std = ys.std(axis=0, ddof=1)y_sem = y_std / np.sqrt(n_runs)y_low = y_mean - 1.96 * y_semy_high = y_mean + 1.96 * y_sem# == 画图:先带子后主线 ==fig, ax = plt.subplots(figsize=(6.83.6))# 置信区间带(背景)ax.fill_between(x, y_low, y_high, alpha=0.25, linewidth=0)# 均值主线(前景)ax.plot(x, y_mean, linewidth=1.5)ax.set_title("不确定性表达:Mean + 95% CI / 均值与95%置信区间", fontsize=14)ax.set_xlabel("Time (day) / 时间(天)", fontsize=12)ax.set_ylabel("Value / 数值", fontsize=12)ax.xaxis.set_major_locator(MaxNLocator(nbins=6))ax.yaxis.set_major_locator(MaxNLocator(nbins=6))ax.yaxis.set_major_formatter(FormatStrFormatter("%.2f"))out_path = os.path.join(OUT_DIR, "fill_between_ci.jpg")fig.savefig(out_path, dpi=300, bbox_inches="tight", pad_inches=0.05)plt.close(fig)print("Saved:", out_path)
05.论文里怎么写图注才不被挑刺?

建议你在图注里明确一句话:

如果是 CI:

“Shaded area indicates the 95% confidence interval.”

“阴影表示 95% 置信区间。”

如果是 std:

“Shaded area indicates mean ± 1 standard deviation.”

“阴影表示均值 ± 1 标准差。”

如果是分位带:

“Shaded area indicates the 10th–90th percentiles.”

“阴影区域表示第10-90百分位区间。”

06.两个最容易误导的坑

一是 带子太深、把线吃掉

解决:带子 alpha 控制在 0.15–0.35;线一定要最后画、线宽略加粗。

二是 用 std 当 CI 

std 和 CI 含义不同,论文里必须说清楚,不要混用术语。

只画一条曲线,你在展示趋势;把不确定性画出来,你才是在展示可信度——fill_between 这条阴影带,往往就是论文图“像不像科学”的分水岭。

下一篇我们聊一个更“容易被误用”的图:《面积图的边界:何时会误导 + 替代方案》。面积图看起来很直观,但在某些情况下会放大差异、制造错觉。下一篇我会告诉你什么时候该用、什么时候千万别用,以及更可靠的替代画法。

——期待你的关注——

 往期内容:

用Python做科研级画图——折线图基础模板

用Python做科研级画图——论文级排版检查清单(Checklist)

用Python做科研级画图——标注与强调:箭头/框/高亮怎么用

用Python做科研级画图——配色与色带:连续离散怎么选

用Python做科研级画图——工具选型:Matplotlib、Seaborn、Plotly、Altair怎么选

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  1. CONNECT:[ UseTime:0.001139s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001566s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000650s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000658s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001364s ]
  6. SELECT * FROM `set` [ RunTime:0.000522s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001486s ]
  8. SELECT * FROM `article` WHERE `id` = 479821 LIMIT 1 [ RunTime:0.008563s ]
  9. UPDATE `article` SET `lasttime` = 1774608289 WHERE `id` = 479821 [ RunTime:0.022091s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000617s ]
  11. SELECT * FROM `article` WHERE `id` < 479821 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001167s ]
  12. SELECT * FROM `article` WHERE `id` > 479821 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001234s ]
  13. SELECT * FROM `article` WHERE `id` < 479821 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.006492s ]
  14. SELECT * FROM `article` WHERE `id` < 479821 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.013327s ]
  15. SELECT * FROM `article` WHERE `id` < 479821 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003910s ]
0.221776s