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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 = | . .                           .                                                                                                                                                                                                                                                                                                         |
     | . 156328039725649027550674945 589552594396166662465824252098512953542235338383043795733335905483825086649927505333840057211407037839234304034252295528051543157410766394019738084751946613655337870988168343032164495745930335351151644564136062286091171376971400369637921231083093770509319873074580788849133222166567644075002953729 |

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 156328039725838693306466305 589552594396166662465824252098512953542235338383043795733335905483825086649927505333840057211407037839234304034252295528051366058582329348310463792453997763790885878259127193693036116795397378339272169585651330891154844721895143374735511910121928416232909715297592653401295435555710319135981305857 |

o6 : MutableMatrix

See also