combn_fast: Fast combination of n elements, taken m at a time
In tsmarch: Multivariate ARCH Models
combn_fast R Documentation
Fast combination of n elements, taken m at a time
Description
Fast combination of n elements, taken m at a time
Usage
combn_fast(x, m)
Arguments
x
integer vector source for combinations
m
number of elements to choose.
Details
This is a significantly faster version of combn. For
an integer vector x of length 1000 and m of 3 which results in a matrix of size
3 x 166,167,000, the speed improvement is about 9 times (11 secs vs 99 secs).
This code is written using Armadillo C++ and 64 bit unsingned integers.
Value
a matrix with m rows.
Examples
all.equal(combn(1:10, 3), combn_fast(1:10,3))
tsmarch documentation built on April 3, 2025, 7:40 p.m.
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| combn_fast | R Documentation |
Fast combination of n elements, taken m at a time
Description
Fast combination of n elements, taken m at a time
Usage
combn_fast(x, m)
Arguments
x |
integer vector source for combinations |
m |
number of elements to choose. |
Details
This is a significantly faster version of combn. For
an integer vector x of length 1000 and m of 3 which results in a matrix of size
3 x 166,167,000, the speed improvement is about 9 times (11 secs vs 99 secs).
This code is written using Armadillo C++ and 64 bit unsingned integers.
Value
a matrix with m rows.
Examples
all.equal(combn(1:10, 3), combn_fast(1:10,3))
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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