snapKrig (version 0.0.2)

Ops.sk: Operations group generics

Description

Applies the operation point-wise to grid data values.

Usage

# S3 method for sk
Ops(e1, e2)

Value

a "sk" object (a copy of e1 or e2) with modified data values

Arguments

e1

a "sk" object, vector or matrix

e2

a "sk" object, vector or matrix

Details

The function extracts the grid data x[] from all sk class arguments x, prior to calling the default method. Before returning, the result is copied back to the grid object of the second argument (or the first, if the second is not of class "sk").

Note that the compatibility of the two arguments is not checked beyond matching dimension (with vectors recycled as needed). This means for example you can do operations on two grids representing different areas, so long as they have the same gdim.

Examples

g = sk_validate(list(gval=stats::rnorm(4^2), gdim=4, gres=0.5))

# verify a trig identity using Ops and Math
summary( cos(g)^2 + sin(g)^2 )

# create a logical grid indicating points satisfying a condition
plot(g < 0)
all( !(g > 0) == (g[] < 0) )

# test negation
all( (-g)[] == -(g[]) )