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linalg::delRow -- delete matrix rows

Introduction

linalg::delRow(A, r) returns a copy of the matrix A in which the row with index r is deleted.

Call(s)

linalg::delRow(A, r)
linalg::delRow(A, r1..r2)
linalg::delRow(A, list)

Parameters

A - an m x n matrix of a domain of category Cat::Matrix
r - the row index: a positive integer <= m
r1..r2 - a range of row indices (positive integers <= m)
list - a list of row indices (positive integers <= m)

Returns

a matrix of a domain of category Cat::Matrix(R), where R is the component ring of A, or the void object of type DOM_NULL.

Related Functions

linalg::col, linalg::delCol, linalg::row

Details

Example 1

We define the following matrix:

>> A := matrix([[1, 2], [3, 4], [5, 6], [7, 8]])
                                +-      -+
                                |  1, 2  |
                                |        |
                                |  3, 4  |
                                |        |
                                |  5, 6  |
                                |        |
                                |  7, 8  |
                                +-      -+

and illustrate the three different input formats for linalg::delRow:

>> linalg::delRow(A, 2)
                                +-      -+
                                |  1, 2  |
                                |        |
                                |  5, 6  |
                                |        |
                                |  7, 8  |
                                +-      -+
>> linalg::delRow(A, [1, 4])
                                +-      -+
                                |  3, 4  |
                                |        |
                                |  5, 6  |
                                +-      -+
>> linalg::delRow(A, 2..4)
                                 +-    -+
                                 | 1, 2 |
                                 +-    -+

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