This module discusses the control parameters for:
The control parameter non determines
whether negative values are allowed as interpolated values. The default
is to allow them. If disallowed, by setting the value of the control
1, then any value that would otherwise be negative
is set to zero.
The plots in
Example 5 illustrate this.
plot that allows negative values with the
plot that does not allow them.
- Negative values
- Vertical orientation
This feature is useful if you have a function, such a pressure,
that should never have a negative value.
The control parameter
upd determines the ordering
of the second dimension of the output array. The default,
"upd = 1", implies a south to north ordering;
setting upd to 0 reverses the order.
Natgrid automatically culls duplicate input coordinates. However,
if two input points have the same X/Y coordinates but different
data values, then a fatal error is issued. Natgrid reports an
informational message about the input coordinates that have been
culled, up to a maximum number of such messages. The control
mdm specifies the maximum number of
messages issued about duplicate points; the default is 10. If
mdm is set to zero, then the culling of duplicate points will