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local_max(array, position [, /subgrid, /bound])
Finds position and value of local maxima in array, starting
at the positions (indices) in position and walking along
the steepest gradient. position must be a scalar or array
of indices to array. By default, a local maximum on the
grid is returned. Keyword /subgrid requests the estimated value
at the subgrid position, as determined from a quadratic fit near the
integer position, with the subgrid position forced to be within one px
in any coordinate from the integer position. Allow far subgrid results
by also specifying /nobound. The last found maximum is put in
!lastmax and !lastmaxloc (the latter always integer), and
all found values are returned. If an indicated position
falls before the beginning or after the end of the array
then the nearest position inside the array is used instead.
See also: local_maxloc, local_min, local_minloc, max, maxloc, !lastmax, !lastmaxloc