pkern_sub: Return a sub-grid of a pkern grid object
In deankoch/pkern: Fast Kriging with Product Kernels
pkern_sub R Documentation
Return a sub-grid of a pkern grid object
Description
Removes grid lines as specified in ij and returns the result as a pkern grid
list; If ij is empty, the function attempts to find a set of grid lines that forms
a complete regular sub-grid of g_obs.
Usage
pkern_sub(g_obs, ij = list(), mirror = FALSE, idx = FALSE)
Details
ij can be a list of integer vectors, named i and j, specifying grid line numbers to
remove, in ascending order. ij can also be a nested list, with the grid lines
to remove in element remove. Alternatively, users can specify the grid lines to NOT
remove in element keep, and the function will remove the others. If both keep and
remove are specified, the function ignores keep and uses remove.
Default idx=FALSE causes the function to return the sub-grid as a pkern grid object.
If idx=TRUE, the function instead returns a list containing keep and remove as
specified above. This can be passed back to pkern_sub when repeatedly cropping multiple
grids in the same way.
mirror=TRUE indicates to mirror the supplied selection of grid lines in ij
about the central grid line. For example ij_rem=list(i=1) removes both the first
(left-most) column and the last (right-most).
When ij is an empty list(), the function sets ij automatically using a
greedy algorithm that iteratively checks all (four) outer grid lines and removes
the one with the highest proportion of NAs. Ties are broken in clockwise order, starting
from the left vertical. The algorithm stops when the remaining sub-grid is complete.
deankoch/pkern documentation built on Oct. 26, 2023, 8:54 p.m.
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| pkern_sub | R Documentation |
Return a sub-grid of a pkern grid object
Description
Removes grid lines as specified in ij and returns the result as a pkern grid
list; If ij is empty, the function attempts to find a set of grid lines that forms
a complete regular sub-grid of g_obs.
Usage
pkern_sub(g_obs, ij = list(), mirror = FALSE, idx = FALSE)
Details
ij can be a list of integer vectors, named i and j, specifying grid line numbers to
remove, in ascending order. ij can also be a nested list, with the grid lines
to remove in element remove. Alternatively, users can specify the grid lines to NOT
remove in element keep, and the function will remove the others. If both keep and
remove are specified, the function ignores keep and uses remove.
Default idx=FALSE causes the function to return the sub-grid as a pkern grid object.
If idx=TRUE, the function instead returns a list containing keep and remove as
specified above. This can be passed back to pkern_sub when repeatedly cropping multiple
grids in the same way.
mirror=TRUE indicates to mirror the supplied selection of grid lines in ij
about the central grid line. For example ij_rem=list(i=1) removes both the first
(left-most) column and the last (right-most).
When ij is an empty list(), the function sets ij automatically using a
greedy algorithm that iteratively checks all (four) outer grid lines and removes
the one with the highest proportion of NAs. Ties are broken in clockwise order, starting
from the left vertical. The algorithm stops when the remaining sub-grid is complete.
R Package Documentation
Browse R Packages
We want your feedback!
Note that we can't provide technical support on individual packages. You should contact the package authors for that.
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