Computes the inner product of two numeric or character arrays.

x %inner% y

## Arguments

x numeric or character array. numeric or character array.

## Value

numeric or character.

## Details

The inner product between two arrays A and B is computed as: $$C = \sum_{j_1\dots j_n} A_{j_1\dots j_n}B_{j_1\dots j_n}$$

## References

Guidotti, E. (2020). "calculus: High dimensional numerical and symbolic calculus in R". https://arxiv.org/abs/2101.00086