apply,dual-method {salad}

Apply functions over array margins of dual objects

Description

This method generalizes 'base::apply' to dual objects.

Usage

## S4 method for signature 'dual'
apply(X, MARGIN, FUN, ..., simplify = TRUE)

Arguments

X

a dual object (with array or matrix shape)

MARGIN

a vector giving the subscript which the function will be applied over

FUN

the function to be applied

...

extra arguments for 'FUN'

simplify

a logical indicating whether the results should be simplified

Value

The returned value depends on the values returned by 'FUN', similarly to 'base::apply'

See Also

apply

Examples

A <- matrix( c(1,2,3,4), 2, 2)
x <- dual(A)
cs <- apply(x, 2, sum)
cs
d(cs)
# prefered method for summing over the columns
colSums(x)