[pstricks] pst-math

[Patrice Mégret]

Dear Herbert, dear Christoph ,

In the package pst-math, the SINC function is defined as:

/SINC {dup SIN exch Div} with the Div operator from pstricks.pro. In that way, no division by 0 takes place at x=0, but  SINC(0) = 0 instead of 1.

I propose to replace the SINC definition by:

/SINC { dup 0 eq { pop 1 } { dup SIN exch div } ifelse } bind def, which makes the same but gives SINC(0)=1.


Here is an example to illustrate the difference:

\documentclass[11pt,a4paper]{book}
\usepackage{pst-func}
\usepackage{pst-math}
\usepackage{pstricks-add}
\begin{document}
\pstVerb{/PMSINC { dup 0 eq { pop 1 } { dup SIN exch div } ifelse } bind def}
\multido{\rA=0+6.18}{10}{%
\makebox[1em]{\rA}
\makebox[5em]{\psPrintValue{\rA\space SINC}}
\makebox[5em]{\psPrintValue{\rA\space PMSINC}}\\
}
\end{document}



Best ragrds,

Patrice


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