original valarray vi

[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26]

vi[gslice(0,{3,3,3},{9,3,1})]

[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26]

vi[gslice(9,{3,3},{3,1})]

[9,10,11,12,13,14,15,16,17]

vi[gslice(3,{3,3},{9,1})]

[3,4,5,12,13,14,21,22,23]

vi[gslice(1,{3,3},{3,9})]

[1,10,19,4,13,22,7,16,25]

vi[gslice(0,{3,3},{3,10})]

[0,10,20,3,13,23,6,16,26]