\documentclass[border=0pt]{standalone}
\usepackage{tikz}
\usepackage{pgfplots}
\usepgfplotslibrary{colormaps}
\usepackage{subfig}
\usepackage{graphicx}
\usepackage{listings}
\usepackage[format=hang]{caption}
\usetikzlibrary{trees}
\usetikzlibrary{plotmarks}
\usetikzlibrary{arrows,decorations.pathmorphing,backgrounds,positioning,fit,petri}
\usepgfplotslibrary{fillbetween}
\pgfplotsset{compat=newest}
\usetikzlibrary{patterns} % for "schraffierte" lines
\usetikzlibrary{calc}
\definecolor{mycolor1}{rgb}{0.00000,0.44700,0.74100}%
\definecolor{mycolor2}{rgb}{0.85000,0.32500,0.09800}%
\begin{document}
\begin{tikzpicture}
\begin{axis}[
title={Neyman Pearson Alpha Representation},
grid=major,
grid style={dashed,gray!30},
xlabel={x values},
ylabel={y values},
%xmin=0, xmax=20,
ymin=0,ymax=0.1,
%ymode=log,
%ymin=0, ymax=1.35,
%xtick={0,50,100,150,200,250,300},
%ytick={0,0.2,0.4,0.6,0.8,1.0},
legend pos=north west,
enlarge y limits={abs=1cm,upper}
%ymajorgrids=true,
%grid style=dashed,
%xmajorgrids=true
%grid style=dashed
]
\addplot[
name path=U,
color=blue,]
coordinates {(-44.848214732850224, 6.894645067806492e-07)
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.............)
};
\addplot[
name path=S,
color=red,]
coordinates {(-8.983669518808362, 8.168426471830885e-07)
(-8.801753562288608, 1.859536502224723e-06)
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.......};
\addplot [name path=line] coordinates {(1.63621746301651,0)(1.63621746301651,0.15)};
\addplot[name path=alpha,red!100] fill between[of= U and line ,soft clip={domain=1.63621746301651 :\infty}];
\addplot[name path=alpha,red!100] fill between[of= S and line ,soft clip={domain=1.63621746301651 : -\infty}];
\legend{U,S}
\end{axis}
\end{tikzpicture}
\end{document}
我正在寻找红色曲线下方的阴影区域，小于乳胶中黑色垂直线指示的阈值线。
我在 \addplot 中为 U 定义了坐标。
为了遮蔽红色区域（U>阈值），我使用了以下代码行
\addplot[name path=alpha,red!100] fill between[of= U and line ,soft clip {domain=1.63621746301651 :\infty}];
但是当我尝试使用以下代码对小于阈值线的 S 曲线下的区域进行着色时
\addplot[name path=alpha,red!100] fill between[of= S and line ,soft clip {domain=1.63621746301651 : -\infty}];
它不起作用。它遮蔽了 S 大于阈值的区域（参见错误图像
）如何纠正此问题？
预期结果-
答案1
使用fillbetween，垂直填充通常比水平填充效果好得多。也就是说，您可能不应该使用您命名line为其中一个图的垂直图来填充区域，而是添加另一个代表是= 0 并将此图命名为line。这样，您可以轻松填充其他两个图下方的区域。然后，您可以使用选项domain将此区域限制为X= 1.63621746301651（或您想要选择的任何值）。
我稍微缩短了你的代码并简化了曲线的坐标列表。
\documentclass[border=10pt]{standalone}
\usepackage{pgfplots}
\usepgfplotslibrary{fillbetween}
\pgfplotsset{compat=newest}
\begin{document}
\begin{tikzpicture}
\begin{axis}[
title={Neyman Pearson Alpha Representation},
grid=major,
grid style={dashed, gray!30},
xlabel={x values},
ylabel={y values},
ymin=0, ymax=0.1,
legend pos=north west,
enlarge y limits={abs=1cm, upper}
]
\addplot[
name path=U,
color=blue,
smooth
] coordinates {
(-44.848214732850224, 6.894645067806492e-07)
(-37.50800711281171, 0.00015997575355931602)
(-20.380855999388526, 0.03299508621844504)
(-13.312507920832925, 0.0628156850968826)
(-6.380855999388526, 0.03299508621844504)
(11.50800711281171, 0.00015997575355931602)
(26.848214732850224, 6.894645067806492e-07)
};
\addplot[
name path=S,
color=red,
smooth
] coordinates {
(-8.983669518808362, 8.168426471830885e-07)
(-2.4346950840971946, 0.0012511081455186875)
(0.4346950840971946, 0.012511081455186875)
(6.4346950840971946, 0.10511081455186875)
(12.4346950840971946, 0.012511081455186875)
(14.4346950840971946, 0.0012511081455186875)
(20.983669518808362, 8.168426471830885e-07)
};
\addplot[no markers] coordinates {(1.63621746301651,0) (1.63621746301651,0.15)};
\addplot[name path=line, draw=none] {0};
\addplot[name path=alpha, red!20]
fill between[of=U and line, soft clip={domain=1.63621746301651 : 100}];
\addplot[name path=alpha, blue!20]
fill between[of=S and line, soft clip={domain=1.63621746301651 : -100}];
\legend{U,S}
\end{axis}
\end{tikzpicture}
\end{document}
