Cost functions

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Cost functions

The function setcostf is used to select the cost function for bestbase, bestlevl, bestbas2, and bestlvl2. The following functions are implemented (see also [13]):

$\ell^p$ norm $\sum \vert x_i\vert^p$ , useful for p close to zero.
$\ell^2$ entropy (unnormalized) $-\sum x_i^2\log x_i^2$ .
Counting the number of elements above a threshold.

Harri Ojanen
1998-05-02