-- -*- M2-comint -*- {* hash: -565742452 *}

i1 : R = ZZ/101[a .. o];

i2 : f = genericMatrix(R, a, 3, 5)

o2 = | a d g j m |
     | b e h k n |
     | c f i l o |

             3       5
o2 : Matrix R  <--- R

i3 : submatrix'(f, {1}, {2})

o3 = | a d j m |
     | c f l o |

             2       4
o3 : Matrix R  <--- R

i4 : submatrix'(f, {1}, {2,3,3,2,2})

o4 = | a d m |
     | c f o |

             2       3
o4 : Matrix R  <--- R

i5 : submatrix'(f, {1,3}, )

o5 = | a d g j m |
     | c f i l o |

             2       5
o5 : Matrix R  <--- R

i6 : submatrix'(f, , {1,3} )

o6 = | a g m |
     | b h n |
     | c i o |

             3       3
o6 : Matrix R  <--- R

i7 : submatrix'(f, {1,3} )

o7 = | a g m |
     | b h n |
     | c i o |

             3       3
o7 : Matrix R  <--- R

i8 :