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\documentclass{article}\usepackage{tikz}\usepackage{tikz-3dplot}\usetikzlibrary{math}\usepackage{ifthen}\usepackage[active,tightpage]{preview}\PreviewEnvironment{tikzpicture}\setlength\PreviewBorder{1pt}%% File name: helicoid.tex% Description:% A geometric representation of an helicoid is shown.%% Date of creation: May, 28th, 2021.% Date of last modification: October, 9th, 2022.% Author: Efraín Soto Apolinar.% https://www.aprendematematicas.org.mx/author/efrain-soto-apolinar/instructing-courses/% Source: page 223 of the% Glosario Ilustrado de Matem\'aticas Escolares.% https://tinyurl.com/5udm2ufy%% Terms of use:% According to TikZ.net% https://creativecommons.org/licenses/by-nc-sa/4.0/% Your commitment to the terms of use is greatly appreciated.%\begin{document}%\tdplotsetmaincoords{60}{120}%\begin{tikzpicture}[tdplot_main_coords,scale=3]% Parametric equations of the surface\tikzmath{function equis(\u,\v) {return \u*cos(\v r);};}\tikzmath{function ye(\u,\v) {return \u*sin(\v r);};}\tikzmath{function zeta(\u,\v) {return \c*\v;};}% Parameter for the function\pgfmathsetmacro{\c}{1.0/(2.0*pi)}% Domain for the graph\pgfmathsetmacro{\uunoi}{-0.75}\pgfmathsetmacro{\uunof}{0.75}\pgfmathsetmacro{\vi}{-2.0*pi}
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