Polygamma

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Polygamma $$\psi ^{(n)}(x)$% WIDTH=55 HEIGHT=37$

$\includegraphics[height=10mm]{images/Polygamma}% WIDTH=49 HEIGHT=46$

Returns the polygamma function of the first argument $x$% WIDTH=13 HEIGHT=14 , with the order $n$% WIDTH=13 HEIGHT=14 being given by the floor of the second argument. $\begin{displaymath} \psi^{(n)}(x)=\frac{d^{n+1}}{dx^{n+1}}\ln\Gamma(x) \end{displaymath}% WIDTH=362 HEIGHT=41$

The operator can be placed on the canvas in two ways:

From the Binary Operations (``binop'') toolbar; or
By typing the letters ``polygamma'' on the canvas and then pressing the Enter key.