出自 DDCC Documentation
This function is to determine how the segment is divided. There are two columns to fill in. The first column i should be filled in an integer 0, 1, or 2.
i = 0: Uniform. This means the segment is divided equally with the same spacing. i = 1: Gradual. This means the segment is divided whether from small spacing to large spacing or in the opposite way. The spacing is distributed like a geometric progression i = 2: Bump. This means the segment can be divided into two forms small-large-small or large-small-large.
|If r < 1||If r = 1||If r > 1|
|Gradual (1)||large -> small||uniform||small -> large|
|Bump (2)||large -> small -> large||uniform||small -> large -> small|
If the total layer thickness is and i=1, then if the smallest separation distance is a where N is the total grid number defined in $ydiv Then
If the total layer thickness is and i=2, then if the smallest separation distance is a where N is the total grid number defined in $ydiv Then
$ynode 0.0 0.5 2.0 3.0
$ydiv 25 30 60
$ygradualdiv 0 1 0.9 2 1.1