Regular Sequence-based stride

stride_seq() specifies a regular sequence for use in the long_ methods.
For example:
long_x(x, stride_seq(from, to, by))
is conceptually equivalent to
x[seq(from, to, by)]

Usage

stride_seq(from, to, by)

Arguments

from

natural scalar giving the starting point of the sequence.

to

natural scalar giving the maximalle allowed end value.

by

natural scalar giving the step-size.

Value

An object of class "stride".

See also

squarebrackets_stride

Examples

x <- mutatomic(1:1e7)

# extract elements 2 to 9
long_x(x, stride_seq(2, 9, 1))
#> [1] 2 3 4 5 6 7 8 9
#> mutatomic 
#> typeof:  integer 

# reverse:
long_x(x, stride_seq(9, 2, 1))
#> [1] 9 8 7 6 5 4 3 2
#> mutatomic 
#> typeof:  integer 

# remove elements 1 to length(x) - 10:
long_x(x, stride_seq(1, length(x) - 10, 1), -1)
#>  [1]  9999991  9999992  9999993  9999994  9999995  9999996  9999997  9999998
#>  [9]  9999999 10000000
#> mutatomic 
#> typeof:  integer 

# replace every other element:
x <- mutatomic(1:1e7)
long_set(x, stride_seq(2, length(x), 2), rp = -1)
#> coercing replacement to integer
head(x)
#> [1]  1 -1  3 -1  5 -1
#> mutatomic 
#> typeof:  integer 

# replace all elements except the first element:
x <- mutatomic(1:1e7)
long_set(x, stride_seq(1, 1, 1), use = -1, rp = -1)
#> coercing replacement to integer
head(x)
#> [1]  1 -1 -1 -1 -1 -1
#> mutatomic 
#> typeof:  integer