[R] matrix built by diagonal matrices with a given structure (2nd trial)

Dear R-users, three weeks ago I sent the mail below, but I didn't receive any response. Maybe it was overlooked. Thanks anyway for all the help you gave us by this mailing-list, Giancarlo Camarda [...] I have a matrix with a series of "not-overlapping in a row dimension" vectors in a given

[R] matrix built by diagonal matrices with a given structure

Dear R-users, I have a matrix with a series of "not-overlapping in a row dimension" vectors in a given structure. Something like: |a1, 0, 0, 0| | 0, a2, a3, 0| |a4, 0, 0, a5| where "ai" are column-vectors of the equal length, m. My aim is to construct a new matrix formed by diagona