linalg::delRow -- delete matrix
rows
Introductionlinalg::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)
ParametersA |
- | 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) |
Returnsa 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
Functionslinalg::col, linalg::delCol, linalg::row
Detailslinalg::delRow(A, r1..r2) deletes those
rows whose indices are in the range r1..r2. If r2
< r1 then the input matrix A is returned.linalg::delRow(A, list) deletes those
rows whose indices are contained in list.DOM_NULL is returned.
Example
1We 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 |
+- -+
DOM_NULL instead of the object
NIL is returned.