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When using \psplot in PS form (or algebraic=false) the interval must be specified in degrees. However, sometimes, I need algebraic=false but interval is given in radian. Is it possible to achieve this scenario?

The following code shows that the output of plotting r=2^(x/2) (radius as a function of angle x) with algebraic=false and algebraic=true are different because PSTricks assumes that interval in first case is in degrees.

\documentclass[preview,border=12pt]{standalone} \usepackage{pst-plot} \psset{polarplot} \begin{document} \begin{pspicture}[showgrid=true](-3,-3)(3,3) \psplot{2 Pi mul neg}{2 Pi mul}{2 x 10 div exp} \end{pspicture}\qquad \begin{pspicture}[showgrid=true](-3,-3)(3,3) \psplot[algebraic]{2 Pi mul neg}{2 Pi mul}{2^(x/10)} \end{pspicture} \end{document}

enter image description here

How to make a radian argument still get interpreted in radian when working with \psplot in PostScript form?

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    The file pst-plot.tex contains a line F@pstplot x \ifPst@algebraic RadtoDeg \fi PtoC, so this conversion for algebraic=true is fixed. Bug or feature, this may be answered by @Herbert. Commented Sep 18, 2013 at 6:37
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    @Christoph: I think it is a bug because the code writers did not anticipate the case in which the interval can represent not only angle but also non-angle. Commented Sep 18, 2013 at 6:42
  • if f(x) is in PS notation then we have x1 and x2 also in PS notation and that is degrees! Commented Sep 18, 2013 at 6:48
  • @Herbert: Then this feature will not allow \psplot[polarplot]{<RPN>}{<RPN>}{<RPN>} to plot a graph of r=f(t)=a^t for example. Commented Sep 18, 2013 at 6:55
  • your first example shows exactly this case! Commented Sep 18, 2013 at 7:01

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this will be the same with the correct syntax!

\documentclass[preview,border=12pt]{standalone} \usepackage{pst-plot} \psset{polarplot} \begin{document} \begin{pspicture}[showgrid](-3,-3)(3,3) \psplot{2 Pi mul neg RadtoDeg }{2 Pi mul RadtoDeg}{2 x DegtoRad 10 div exp} \end{pspicture}\qquad \begin{pspicture}[showgrid](-3,-3)(3,3) \psplot[algebraic]{2 Pi mul neg}{2 Pi mul}{2^(x/10)} \end{pspicture} \end{document}
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  • What is wrong?? (Pi,2^(Pi/10) is (3.14,1.2) Commented Sep 18, 2013 at 7:57
  • OK. I was wrong. The point cannot be represented in RPN-Infix syntax because the function represents r value rather than y. Commented Sep 18, 2013 at 7:59

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