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Macaulay2Doc :: Matrix _ Sequence

Matrix _ Sequence -- get entry of matrix

Synopsis

Description

All indexing in Macaulay2 is zero-based, so the indices start at zero.
i1 : M = matrix{{1,2,3},{0,5,6}}

o1 = | 1 2 3 |
     | 0 5 6 |

              2        3
o1 : Matrix ZZ  <--- ZZ
i2 : M_(1,2)

o2 = 6
The matrix may be a a mutable matrix too:
i3 : N = mutableMatrix M

o3 = | . .                           .                                                                                                                                                                                                                                                                                                         |
     | . 157536965545509947330002945 590111429682836384013088036458171329475548163577442375806654842572332476646339702151223594391108362140842145591491414302736888154752753958523730228295599772640154481663860819515206011426016253431948762200295870205843202302226900852898292731449584710402312030076033924990634245506583342158220099585 |

o3 : MutableMatrix
i4 : N_(1,0)

o4 = 0
Entries of mutable matrices can be changed:
i5 : N_(1,0) = 37

o5 = 37
i6 : N

o6 = | . .                           .                                                                                                                                                                                                                                                                                                         |
     | 1 157536965545699613085794305 590111429682836384013088036458171329475548163577442375806654842572332476646339702151223594391108362140842145591491414302736711872907540315121646771416883154002465420376262298692055628895084246431494317478934645784980020541952251060897846950195984667061848193630651881091211093133553967998875729921 |

o6 : MutableMatrix

See also