Function add 

pub fn add<Da: Dimension, Db: Dimension>(
    a: &StringArray<Da>,
    b: &StringArray<Db>,
) -> FerrayResult<StringArray<IxDyn>>

Elementwise string concatenation with broadcasting.

Concatenates corresponding elements of a and b. If shapes differ, NumPy-style broadcasting is applied (e.g., a scalar string is broadcast against an array).

The result is always a dynamic-rank StringArray<IxDyn>.

Errors

Returns FerrayError::BroadcastFailure if shapes are incompatible.