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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 = | . .                            .                                                                                                                                                                                                                                                                                                                   |
     | . 1145844448173434954129080321 2621364775233614471428444041026243597536797492300384006430548317080946301977529256849090024098033989792812639040548486884566548826507923724531163704511239561967118175929262631873471185083873942094928679630828202477132188126711429629536643762189342872293165271082899342063341417661984423508017578798013743105 |

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 1145844448173434954129080321 2621364775233614471428444041026243597536797492300384006430548317080946301977529256849090024098033989792812639040548486884566548826507746922226494770247602315326516112631362658921755260858022731510632687517290483880642850960528507855092364233432564899245081690135422992040003279981218788668560755586188181505 |

o6 : MutableMatrix

See also