I have rectangular forward range of forward ranges (not arrays): [ [a11, a12, ... a1N], [a21, a22, ... a2N], ... [aM1, aM2, ... aMN] ]
I need lazy forward range: [ a11 + a21 + ... aM1, a12 + a22 + ... aM2, ... a1N + a2N + ... aMN ] Range of sum elements of every columns; M, N - runtime values;Is there a way to do this using only Phobos algorithms and range functions?