[Octave] Menambah dan Mengurangi Kolom pada Matrix

octave:7> a=rand(4)
a =

0.936431  0.187126  0.081269   0.431673
0.390220 0.659526  0.200293  0.171343
0.973633  0.857778 0.170740  0.664809
0.921939  0.262639  0.143312   0.540488

octave:8> a(:,1)=[]
a =

0.187126   0.081269  0.431673
0.659526   0.200293 0.171343
0.857778  0.170740  0.664809
0.262639   0.143312  0.540488

octave:9> a=[a(:,1),a]
a =

0.187126   0.187126   0.081269  0.431673
0.659526   0.659526  0.200293  0.171343
0.857778  0.857778  0.170740  0.664809
0.262639  0.262639   0.143312   0.540488