Modifying the element in the vector of vectors

[MKY]

What should I do if I just want to modify the fifth element in the third vector?

[Dan]

The vector of vectors, has several copies of the same vector (backed by same memory). The proper way to initialize a vector with different vectors is:

waccf = [zeros(5) for _ in 1:7]

This way, every vector is in a different memory location and the assignment works as expected.

[Benny]

@Dan

several copies of the same vector (backed by same memory)

To nitpick on terminology, it’s the same vector referenced by all elements of the vector-vector; copy implies different memory.