使用以下代码,我可以绘制抛物线 y=x^2,但无法绘制抛物线 x=y^2,显示一些错误,请帮忙。
\documentclass{article}
\usepackage{tikz,pgfplots}
%\usepackage[x11names]{xcolor}
\usepackage{tikz}
\usetikzlibrary{intersections}
\pgfdeclarelayer{bg} % declare background
\pgfsetlayers{bg,main} % order of layers (main = standard layer)
\pgfplotsset{compat=1.13}
\usepackage{amsmath}
\usetikzlibrary{positioning}
\begin{document}
\begin{tikzpicture}[domain=0:2, scale = 0.75]
\draw(-4,0)--(4,0);
\draw (0,-4)--(0,4);
\draw[black, line width = 0.50mm] plot[smooth,domain=-2:2] (\x, {(\x)^2});
\draw[black, line width = 0.50mm] plot[smooth,domain= -2:2] (\y, {(\y)^2});
\end{tikzpicture}
\end{document}
答案1
添加variable=\y
。结果显然是一样的。
\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}[domain=0:2, scale = 0.75]
\draw(-4,0)--(4,0);
\draw (0,-4)--(0,4);
%\draw[black, line width = 0.50mm] plot[smooth,domain=-2:2] (\x, {(\x)^2});
\draw[black, line width = 0.50mm] plot[smooth,domain= -2:2,variable=\y] (\y, {(\y)^2});
\end{tikzpicture}
\end{document}
您也可以调用 plot 变量\CuteFurryRodent
,您仍然会得到
\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}[domain=0:2, scale = 0.75]
\draw(-4,0)--(4,0);
\draw (0,-4)--(0,4);
\draw[black, line width = 0.50mm]
plot[smooth,domain= -2:2,variable=\CuteFurryRodent] (\CuteFurryRodent, {(\CuteFurryRodent)^2});
\end{tikzpicture}
\end{document}
你可能想交换 x 和 y 的角色,
\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}[domain=0:2, scale = 0.75]
\draw(-4,0)--(4,0);
\draw (0,-4)--(0,4);
\draw[black, line width = 0.50mm] plot[smooth,domain=-2:2] (\x, {(\x)^2});
\draw[blue,dashed, line width = 0.50mm] plot[smooth,domain= -2:2,variable=\y]
( {(\y)^2},\y);
\end{tikzpicture}
\end{document}
这里也可以使用parabola bend
。
\documentclass{article}
\usepackage{tikz}
\begin{document}
\begin{tikzpicture}[domain=0:2, scale = 0.75]
\draw(-4,0)--(4,0);
\draw (0,-4)--(0,4);
\draw[black, line width = 0.50mm] (-2,4) parabola bend (0,0) (2,4);
\draw[blue,dashed, line width = 0.50mm,rotate=-90] (-2,4) parabola bend (0,0) (2,4);
\end{tikzpicture}
\end{document}