Useful tricks for matrix manipulation
matricks is available on CRAN, so you can install it using simply:
install.packages('matricks')
If you rather want to install dev version, you can do it with devtools.
devtools::install_github('krzjoa/matricks')
Main matricks functions are m and v, which provide convenient API to create matrices and vectors.
Why should we write:
matrix(c(5, 6, 7,
8, 0, 9,
3, 7, 1), nrow = 3, byrow = TRUE)
#> [,1] [,2] [,3]
#> [1,] 5 6 7
#> [2,] 8 0 9
#> [3,] 3 7 1
if we can simply create such a matrix like that:
library(matricks) m(5, 6, 7| 8, 0, 9| 3, 7, 1) #> [,1] [,2] [,3] #> [1,] 5 6 7 #> [2,] 8 0 9 #> [3,] 3 7 1
v function is an useful shortcut for creating vertical vectors (single columns)
v(1,2,3) #> [,1] #> [1,] 1 #> [2,] 2 #> [3,] 3 v(1:5) #> [,1] #> [1,] 1 #> [2,] 2 #> [3,] 3 #> [4,] 4 #> [5,] 5
Setting values in easier with matricks
mat <- matrix(0, 3, 3) set_values(mat, c(1, 2) ~ 0.5, c(3, 1) ~ 7) #> [,1] [,2] [,3] #> [1,] 0 0.5 0 #> [2,] 0 0.0 0 #> [3,] 7 0.0 0
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