merging two vectors into one that takes the second input after the first

I am trying to have a feedback signal (signal 2) starts immediatly after initial signal (signal 1). Signals 1 and 2 are two vectors with time dimension at the same sampling rate. The way I thought about this is to have a merge block with a unit delay on the second input signal, but not exactly sure how to implement that in terms of the settings for the unit delay and subsystem for the merge inputs. Please help. Thanks in advance!

[Mathieu NOE]

hello

maybe another alternative is to use the switch block

you need athird signal to say when to switch from signal 1 to signal 2

[Samy Alkhayat]

Thank you.