Graphics, Figures & Tables ⇒ plot curve

[localghost]

Sorry, but I can't follow you. I'm outty.

[ditka]

It is possible to draw that picutre with latex:

(considering that this is slightly diffrent then what I want at the beginning, should I open new topic?)

[localghost]

This is the very last thing I can offer.

Code: Select all

\documentclass[11pt]{standalone}
\usepackage[T1]{fontenc}
\usepackage{tikz}

\begin{document}
  \begin{tikzpicture}[>=stealth]
    \fill[blue!25] plot[parametric,samples=50,domain=1.5708:3.1416] function {0.5*t*sin(t+0.5*pi),-0.5*t*cos(t+0.5*pi)} -- (0,0) -- cycle;
    \draw[blue] plot[parametric,samples=100,domain=0:6.2832] function {0.5*t*sin(t+0.5*pi),-0.5*t*cos(t+0.5*pi)};
    \draw[->] (-4,0) -- (4,0) node[right] {$x$};
    \draw[->] (0,-4) -- (0,4) node[above] {$y$};
  \end{tikzpicture}
\end{document}

And you should really, really read the pgf/tikZ manual.

[cgnieder]

Reading manuals is really helpful! I didn't know how to do this 10 minutes ago (and will have forgotten it again in two days):

Code: Select all

\documentclass{scrartcl}
\usepackage{pgfplots}

\begin{document}

\begin{tikzpicture}
 \begin{axis}[
   ticks=none,
   axis y line=center,
   axis x line=middle,
   axis on top,
   domain=0:2*pi]
  \addplot[fill,mark=none,red!10,samples=100,domain=.5*pi:pi]
    ({.5*x*sin(deg(x)+90))},{-.5*x*cos(deg(x)+90))}) \closedcycle;
  \addplot[mark=none,red,samples=50]
    ({.5*x*sin(deg(x)+90))},{-.5*x*cos(deg(x)+90))}) ;
 \end{axis}
\end{tikzpicture}

\end{document}

pgfplots.png (4.47 KiB) Viewed 9227 times

Regards

[ditka]

This is the very last thing I can offer.

Code: Select all

\documentclass[11pt]{standalone}
\usepackage[T1]{fontenc}
\usepackage{tikz}

\begin{document}
  \begin{tikzpicture}[>=stealth]
    \fill[blue!25] plot[parametric,samples=50,domain=1.5708:3.1416] function {0.5*t*sin(t+0.5*pi),-0.5*t*cos(t+0.5*pi)} -- (0,0) -- cycle;
    \draw[blue] plot[parametric,samples=100,domain=0:6.2832] function {0.5*t*sin(t+0.5*pi),-0.5*t*cos(t+0.5*pi)};
    \draw[->] (-4,0) -- (4,0) node[right] {$x$};
    \draw[->] (0,-4) -- (0,4) node[above] {$y$};
  \end{tikzpicture}
\end{document}

And you should really, really read the pgf/tikZ manual.

From this I only get the cooridnate axis, no graph.

[localghost]

From this I only get the cooridnate axis, no graph.

It will require Gnuplot. So your old problem reappears. Too bad.

[ditka]

Ok. How did you know which function to use?

[localghost]

[…] How did you know which function to use?

By reading a mathematics textbook or in this case the corresponding Wikipedia article [1]*. That's a common practice. Your version needed slight adaptations to the printed function.

[1] Archimedean spiral – Wikipedia, the free encyclopedia

* The German version of this article is more comprehensive. Perhaps in other languages, too.

[ditka]

What if I want to use other polar plots, for which I do not know parametric equation(or it maybe do not even exist?)(for example polar rose).

And is it possible to fill the place with dots or lines insted of a color?

[localghost]

What if I want to use other polar plots, for which I do not know parametric equation(or it maybe do not even exist?)(for example polar rose). […]

The site you linked clearly shows that the function for this rose is r=cos(kθ). So you just have to translate that.

Code: Select all

\documentclass[11pt]{standalone}
\usepackage[T1]{fontenc}
\usepackage{pgfplots}
\usepgfplotslibrary{polar}
\usetikzlibrary{patterns}

\begin{document}
  \begin{tikzpicture}
    \begin{polaraxis}[hide axis]
      \addplot+[pattern=dots,pattern color=blue,mark=none,domain=0:360,samples=300]{cos(4*x)};
    \end{polaraxis}
  \end{tikzpicture}
\end{document}

Perhaps some reading in mathematics would be good if you need such elements.

[…] And is it possible to fill the place with dots or lines insted of a color?

You really need to learn how to read manuals. All of these questions can be answered with RTFM. Search the pgf/tikZ manual for pattern (see code above).