Elementwise math functions for delarr

Supports the R Math group generics (sqrt(), abs(), exp(), log(), round(), floor(), the trig functions, and so on) lazily, as fused elementwise maps. Extra arguments are forwarded to the underlying function, so round(x, 2) and log(x, base = 2) work as expected.

Usage

# S3 method for class 'delarr'
Math(x, ...)

Arguments

x

A delarr.

...

Additional arguments forwarded to the math generic.

Value

A delarr representing the fused elementwise operation.

Details

The cumulative generics (cumsum(), cumprod(), cummax(), cummin()) are not elementwise and cannot be evaluated chunk-by-chunk, so they raise an error rather than returning silently incorrect results.

Examples

mat <- matrix(1:12, nrow = 3, ncol = 4)
darr <- delarr(mat)
collect(sqrt(darr))
#>          [,1]     [,2]     [,3]     [,4]
#> [1,] 1.000000 2.000000 2.645751 3.162278
#> [2,] 1.414214 2.236068 2.828427 3.316625
#> [3,] 1.732051 2.449490 3.000000 3.464102
collect(-darr)
#>      [,1] [,2] [,3] [,4]
#> [1,]   -1   -4   -7  -10
#> [2,]   -2   -5   -8  -11
#> [3,]   -3   -6   -9  -12