Objects from the Class
Objects can be created by calls of the form new("scidbdf", ...),
scidb("ARRAY_NAME", ...), or as.scidb(R_DATA_FRAME, ...).Slots
name:- Object of class
"character" scidb array name. attributes:- Object of class
"character" Vector of SciDB attribute names. dimensions:- Object of class
"character" Vector of SciDB dimension names. schema:- Object of class
"character" SciDB array schema. logical_plan:- Object of class
"character" SciDB array plan. gc:- Object of class
"environment" An environment used to link the SciDB array to the R garbage collector. .S3Class:- Object of class
"character" ~~
Methods
- is.scidbdf
signature(x = "scidbdf"): ... - is.scidbdf
signature(x = "ANY"): ... - print
signature(x = "scidbdf"): ... - head
signature(x = "scidbdf"): ... - tail
signature(x = "scidbdf"): ... - show
signature(object = "scidbdf"): ... - Filter
signature(f="character", x = "scidbdf"): Filter(f,x)
'Filter' masks elements of a vector for which a predicate (logical) SciDB expression 'f' returns false by making them empty, returning a sparse version of the array.
- sin
signature(x = "scidbdf"): sin(x)
Return an array with the sine of each element of the array x. The first listed attribute is used and should be numeric. The returned array contains a new attibute with "_sin" appended containing the result. Additional trig functions (cos, tan, asin, acos, atan) act similarly.
- abs
signature(x = "scidbdf"): abs(x) See doc. for sin.- sqrt
signature(x = "scidbdf"): sqrt(x) See doc. for sin.- exp
signature(x = "scidbdf"): exp(x) See doc. for sin.- cos
signature(x = "scidbdf"): cos(x) See doc. for sin.- tan
signature(x = "scidbdf"): tan(x) See doc. for sin.- asin
signature(x = "scidbdf"): asin(x) See doc. for sin.- acos
signature(x = "scidbdf"): acos(x) See doc. for sin.- atan
signature(x = "scidbdf"): atan(x) See doc. for sin.- unpack
unpack(x = "scidbdf"): unpack(x)
Return a 1-D representation of an array using the SciDB array unpack operator.
- regrid
signature(x = "scidbdf"): regrid(x, grid, expr)
Decimate the n-d SciDB array x by binning its coordinate system according to the grid argument and applying the aggregate expression on each bin. The grid argument must be the same length as the dimension of the array x. For example if x is a 10x10 matrix, then regrid(x, c(2,1)) returns a 5x10 matrix replacing the rows with the average of values along every two rows.
- xgrid
signature(x = "scidbdf"): xgrid(x, grid=c(m,...))
Prolong the coordinate system of the n-d SciDB array x by replicating its values according to the grid parameter. In some cases, xgrid can be the inverse operation of regrid. For example if x is a 10x10 matrix, then xgrid(x, c(2,1)) returns a 20x10 matrix, replicating values twice along the row dimension.
Notes
Like the related scidb class, the scidbdf class represents
SciDB arrays as R objects. The scidbdf class presents 1-D SciDB arrays,
potentially with many SciDB attributes (variables), as a data.frame-like object. Use the special empty-bracket index [] to return data from SciDB to R.