2016-11-05 11:54 GMT-02:00 Allin Cottrell <cottrell@wfu.edu>:

On Fri, 4 Nov 2016, Henrique Andrade wrote:

Dear Allin and Jack,

I think there is an error in the definition of the digamma function in
Gretl Command Reference.

Now we have:

<tex>
\psi(x) = d\Gamma(x)/dx
<\tex>

And I think it should be:

<tex>
\psi(x) = d\Gamma'(x)/dx
<\tex>

The ways I'm seeing it as written are

\psi(x) = d/dx ln \Gamma(x)

or

\psi(x) = \Gamma'(x) / \Gamma(x)

I've put the first of these into the TeX doc.

Allin

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