Hi everyone!

I’m new to Julia, so the answer to my question is possibly trivial. I have an array A(n,m) in which I store indices that are used to iterate over other data structures (e.g., vectors, matrices,…). Since Julia starts indexing vectors with 1 (instead of 0 like in e.g, C++), I need to store many 1’s in A. In my case, A consumes much memory, but B = A(n,m) - ones(n,m) is sparse and consumes much less. I need to access these values often in my code. Clearly, I could add “+1” each time when accessing element B[i,j], but this is really a mess (for reading and debugging). Therefore, it would be convenient to store only the “non-ones” instead of the “non-zeros”.

Do you know an option to “shift” the base of a sparse array (as sketched above from 0 to 1), or at least an efficient (readable, debugging-friendly) work-around?