`Runtime_comparison.Rmd`

The computation of codebooks in `pdc`

up to embedding dimension 7 is implemented in C code for faster execution. Here is a comparison of the gain in speed by switching from the R implementation using `sort`

to the C implementation based on nested `ìf`

blocks. First, the fast computation in C:

```
N <- 50000
x <- rnorm(N)
tic()
codebook <- pdc::codebook(x, m=7, use.fast = TRUE)
toc()
#> 0.006 sec elapsed
```

Then, the naive implementation in R: